AITA for shutting my sister out after she told our mom something I admitted to her in confidence?

After the loss of their father eight years ago, two sisters found themselves navigating a world forever altered by grief and change. When their mother remarried, bringing new siblings into their lives, the younger sister struggled silently with feelings of detachment, unable to embrace this new family as her own. The weight of unspoken emotions and unmet expectations hung heavy between them, a quiet testament to the complicated nature of love and loyalty.

In a rare moment of vulnerability, she confided in her sister, revealing the truth she had long hidden: her heart remained tethered to the past, resistant to the blended family her mother had chosen. Despite her emotional distance, she was determined not to disrupt their mother’s newfound happiness, carrying the burden of her conflicted feelings alone. This poignant admission illuminated the silent fractures beneath the surface, where love, loss, and acceptance intertwined in a fragile dance.

AITA for shutting my sister out after she told our mom something I admitted to her in confidence?

My sister (15f) and I (16f) lost our dad 8 years ago. 4 years ago our mom remarried. Her husband came with two kids of his own (11m) and (7f) and they have a baby together (4mo m). I admitted to my sister a while ago that I hadn’t been on board when our mom first told us she was getting married again, and that I really only accept it for her, but not for me.

I admitted I don’t love them or see them the same as I see her, mom or dad. And that I will probably always be detached because this is not the way I would have ever chosen my family to me.

But I don’t want to ruin mom’s happiness. I admitted this to her because my sister always suspected. She noticed differences. Remembered how I would always invite her into my bed when she had nightmares vs not really doing anything like that if one of our stepsiblings did.

Or how I am affectionate with her and not them or our half brother. And how I never really tell our mom’s husband anything about me like I do mom, and how most stuff comes through her to him.

She pressed and I was honest. I told her not to tell them because it didn’t need to be a big deal. She promised she wouldn’t.

Well, she told our mom. Pretty much everything. And then my mom decided the three of us (me, her and her husband) need family therapy so they can figure out a way to get me to welcome them into my heart the way she wants me to.

And now I’m stuck in family therapy with them trying to achieve a goal I don’t want to achieve.

And I am so pissed off with my sister. She told me she did it so we could be one big happy family and I told her she betrayed my trust and she can never ever expect me to come to her again because I know she won’t keep a promise to herself.

She was upset and now she’s even more upset because I am not the same with her anymore. The way I look at it is she broke my trust when I wasn’t going to tell her anyway, but then she pushed and then promised to keep it and she didn’t.

My mom told me I’m being mean and that my sister did the right thing telling her. She told me I should have been open with her so we could have done therapy together sooner. I told her I never wanted to go to therapy with them and I didn’t want this big deal being made out of it.

She told me that regardless, I shouldn’t shut my sister out and it’s hurtful and mean.

Here’s how people reacted:

Kurra

Slightly ESH in my opinion. Your sister should have respect for what you told her on confidence, but perhaps the grief, hurt, and immense loss of your father is clouding your ability to let people new people into your life? They will never be a replacement, but if they’re good people, maybe YOU deserve to let them into your life? You said you’re 16, and that you lost your dad 8 years ago – I couldn’t imagine how horrible that would be for you, at such a young age. I know you said you don’t *want* to achieve this goal, but why is that? Are you potentially self-sabotaging a new and maybe loving relationship with the new members of your family because you’re still grieving the loss of your father? I think family therapy could be a good idea. It might allow you to bring up these feelings, and find the root cause of your detachment. I will reiterate, I think your sister sold you out, you disclosed very personal feelings to her. The outcome, however, might be beneficial to you in the long run if you go in with an open mind.

You are not obligated to love anyone, if you truly don’t feel it. If these people just don’t mean much to you, you’re allowed to have those feelings. But I would hate to think that your past experiences are putting up their walls with unconscious self preservation.

EDIT: I’m not upset about the downvotes or anything, I just want to give a bit of background as to why I have the opinion I have. I come from a mixed family, which has its own unique sets of problems. I hate my stepfather more than anyone in the world, but I love my half brothers more than I love myself. Family therapy would not have helped me in her situation, but I think in any situation it’s important to consider if detachment is the result of any underlying feelings of grief. She suffered a terrible loss at a young age, and is still young, and going through therapy would give her an opportunity to work through some of that emotion. I think given the info, my guess is as good as any as to how their family dynamic plays out in the real world. Again, this is all just my opinion! At the end of the day we’re all just here to give our two cents!

nika_sunshine_1990

I’m going to say NAH.
You told your sister something that was really painful and I believe that she thought she was doing the right thing by telling your mom. I’m an advocate for therapy and the fact that your mom and step dad are willing to go that far for you, and allow you a safe space to open up is them trying to be good parents. I get that your sad. Restructuring families is hard, but for you to not try I think is a deeper problem. This is a hard thing. And.i think giving them a chance to know why you feel the way you do is part of a healthy familiar relationship. You’re not a bystander and they are trying to include you and make.sure you have a say with your feelings, even if it’s hard for them to hear. Plus if you can’t be honest with your own family how are you going to have healthy relationships outside of your family?
Also please hear me out. Please eventually.forgive your sister. You don’t have to tell her your secrets anymore, but don’t let this one thing ruin your relationship with her.
Let me tell you I was very close to my sister, and we got into a huge fight and when she reached out for forgiveness I denied her. Guess what. She died 2 weeks later, unexpectedly and I regret that moment so much. I’ll never get it back. Please don’t be like me.
Your sister sounded like she did this out of love for you.
TheBearWillBeFine

Going NTA. So long as you weren’t being overly mean or openly disrespectful to your step family members, you’re not required to treat them like your mother or sister if you don’t want to, and your mother trying to force it won’t help. My parents have been happily married 42 years, and I love them both, but there are definitely still times (I’m 35) where I’ll tell mom something and say “please don’t tell dad yet” or “can you tell dad this thing? You’re better at getting stuff to fit in his head”. And I don’t really blame you on your sister. Trust is very important, and she blatantly broke yours, so again, so long as you’re not being overtly mean/rude, you’re not required to just snap back to how you were before. Are you planning to head to college or anything where you’d be able to move out when you’re 18? That’d make this whole thing easier, since if you’re not under the same roof, it’s harder to try and force relationships
cullymama

I’m going NTA, your sister should have kept your secret.

However, I really do think you should give family therapy a try. You say this isn’t how you envisioned your family ending up, but do you think your mom did? I bet she didn’t either. I bet she envisioned growing old with your dad, watching you & your sister grow up with him, celebrating all of life’s milestones with him. It absolutely sucks that you lost your dad, and I am truly, incredibly sorry for your loss sweetheart. But your mom & sister lost him too. She became a widow very young, should she spend the rest of her life alone? That’s not fair to her. I can understand not having the same bond with the step siblings or step dad that you had with sis or dad, but they didn’t take him away from you, and are not trying to replace him. Sending lots of hugs to you sweetheart.

Chamit

NAH.

You’re 16 and your sister is 15. I am not going to insult your intelligence or maturity by pointing out how young you both are but please keep that in mind.

You sound mature for your age, and your sister sounds like a 15 year old trying to understand the dynamic of what’s going on and looked to her big sister. She was misguided and wrong for what she did, but not malicious. Your anger isn’t wrong or not warranted but use that advanced maturity for some perspective. Your mom and step dad are whatever, deal with the therapy but be clear that you don’t want to be there. Your sister on the other hand deserves a hug and a talk about how you and her are a team and need to have each others back. She didn’t do something to hurt you, she thought, with her 15 yr. old brain that she was actually helping.

baggleboots

I’m sorry you’re going through this. You have a right to be upset for your sister betraying your confidence. I do think she was trying to help, and wasn’t trying to be malicious, but that still doesn’t make it right. This might not be a popular opinion, but I think therapy will help you a great deal. Not joint family therapy, but therapy just for you. You’ve been through a lot at such a young age, it’s normal for you to feel the way you do. Having someone removed from the situation to help you sort through your feelings would probably be very helpful to you. And please note that any therapist you talk to is not permitted to tell you mother what you speak about. (Unless you’re planning to hurt yourself or others) I’m sorry for the loss of your dad. NTA

edit: spelling

PotatoLover-3000

NTA. There is nothing wrong with how you feel. Your mom and stepdad should not be validating their feelings by invalidating yours.

Your sister broke your trust and a promise she made to you. You don’t have to forgive her and it doesn’t make you an asshole if you don’t. It’s up to you when you trust her again (if ever) and up to her to prove to you she’s trustworthy. Your sister and family don’t get to dictate your feelings or timeline for acceptance. You were also already “one big happy family” before your sister meddled. You were fine with your step-family in your own way and respected them. It also doesn’t seem that anyone was complaining or bothered about your behavior before your sister’s confession.

BertTheNerd

This is really tricky, bc everyone in this story just tried to do oneselves best. Is your sister justified by her best intentions? Or does a promise and your wish overweight?

I will go with NTA towards your sister. For one reason. She pushed you to this confession. So she knew already while listening, she would tell this all to mum. She deserves a silent treatment.

On the other side… all other sides are not TA. You ar justified to punish you sister, on the other side i agree, that a family therapy may be a good idea. This is a thing, where you can put even this point. I know, this is not an advice sub, but i will give you this one anyway: give it a chance.

Jemma_2

YTA to yourself here. ❤️

Your sister did do what was best, you just won’t be able to see that for a while. Your mum knowing what’s hurting you gives her a chance to help. Therapy gives you a chance to heal.

Give therapy a chance. Give your sister a break. And consider what type of relationship you want to have with your step-siblings (you don’t have to have the same sort of relationship with them as you have with your sister. You don’t have to have very much of one at all, if you don’t want. But don’t not have a relationship with them just because they are your step-siblings. Get to know them as people and decide based on that).

You’ll be ok. ❤️

Melodic_Childhood699

Going against the grain and saying you are a little bit the asshole here. You have decided that no one can be happy because you aren’t. Because you decided to not want a happy family. Your mom has a young infant and needs help, not this crap. What did a 4 month old do to you? Will you hate them when you are 26 and the child is 10 just for existing? You may not like your situation but is it fair to make everyone miserable ? Go to family counseling and voice your opinions but try to find a way to make it ok until you can go to college. So sorry to hear about your dad. I hope you find a way to live life in a way that brings you peace.
valerian_spiel

NTA. But for your own sake, try not to let your anger toward your sister eat away at you. Would it be possible to have your mother arrange a personal therapist for you as well. You have every right to your feelings, and you deserve a safe space to vent and work those feelings through.

It would be nice if blended families were all as perfect as the Brady Bunch, but the reality is that kids don’t accept a new parent and siblings just because the adults involved want it that way. It’s time your mother realized that, and stopped pressuring you to feel or act a certain way because it’s convenient for her and the rest of the family.

mmartinez59

NTA and I have to say that you make a very reasonable argument. You weren’t being a downer, you just weren’t interested in a relationship with people that you did not choose. And your sister did betray your trust, but you’re not saying you hate her, only that you cannot trust her anymore. I think you should let your mom and step father know that you are not likely to change your mind. You will still treat everyone with respect, but you get to decide how you react to situations in your life. Let them know in therapy so the therapist is aware. After that it’s just a couple of years and your decisions are your own.
nika_sunshine_1990

I literally don’t understand why everyone thinks everybody is a master manipulater. Also is it really such a bad idea to go to therapy? Or fuck it OP disown your family. Fuck your sister, mom, step siblings. Give them the bare minimum if that will help you feel better.
Life is fucking tough. It doesn’t sound like you have an overtly narcissistic family. So I just don’t get the not wanting to try. Your mom found new love. She’s trying to include you. She got info from your sister because you apparently can’t tell your mom how you feel? And she tried to make it right. Good luck to you.
KerrieJune

NTA – what you told her in confidence should’ve stayed that way. Also – there’s nothing wrong with how you feel. Could it be extremely disappointing to your mom, stepdad, step siblings? Yes. And that’s totally valid, but it doesn’t make you an AH. Family therapy really only works if all the parties involved have a desire to reach the same shared outcome. Maybe you should use therapy as a springboard to share what kind of relationship you DO want with your step family. I think there can be equal parts you being open to them and them changing their expectations to reflect your feelings.
salukiqueen

Wow. I’m sorry OP. NTA and I don’t blame you for feeling like she broke your trust because that’s exactly what she did. I think they’re well meaning but you can’t force someone to feel something they don’t and it sounds like you were treating everyone respectfully. Relationships take time and they’re going about this by pushing you. I’m sorry. I don’t have advice – therapy may be good but individual therapy not group.
CakeisaDie

NTA

Your mother and your sister are for trying to force something.

Take a try at therapy and see if you can find a happy spot for you and if it doesn’t work you need to show your mother that if she didn’t realize for over 4 years, it means that you are respectful to the rest of your family and you have preferences and that isn’t a bad thing.

MandeeLess

NTA. There wasn’t anything wrong with your feelings, and your mom and sister are TA for trying to force this on you. It’s completely understandable why you’d be wary of confiding in your sister again. She used something you told her in confidence to manipulate you into getting the family SHE wants.
mference123

NTA, but be honest in therapy. The therapist may be able to set your Mom straight about not being able to force family feelings.
Blueheron77

NTA -Being betrayed sucks. You don’t have to trust anyone, let alone someone who proved themselves untrustworthy.

Conclusion

The original poster (OP) is facing significant emotional conflict stemming from the blending of her family following her father’s death and her mother’s remarriage. Her core issue is a refusal to emotionally connect with her stepfather and stepsiblings, which she kept secret but eventually admitted to her sister. When the sister revealed this confidence to their mother, the OP felt a profound sense of betrayal, leading to a breakdown in trust with her sister and forcing her into family therapy against her will.

The central question remains whether the OP was justified in feeling betrayed by her sister’s breach of confidence, or if the sister acted appropriately by sharing the OP’s feelings to facilitate family unity and mental health intervention as desired by the mother. Is maintaining personal boundaries and privacy more important than upholding the idealized vision of a ‘one big happy family’?

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