AITA for Telling My Sister’s Fiancé About Her Secret?

The narrator, a 28-year-old female, has a close relationship with her younger sister, Jane (25F), who is engaged to Mark (27M). Jane has kept a significant secret from Mark: she previously gave birth to a son who was given up for adoption three years ago. The narrator was aware of this situation from the time of the pregnancy and adoption and was made to promise secrecy.

Recently, the narrator felt guilty about Mark being unaware of this major part of Jane’s past and suggested Jane tell him before their upcoming wedding. Jane strongly refused, claiming it was irrelevant information that would cause problems, and threatened to end the relationship with the narrator if the secret was revealed. Despite this warning, the narrator decided to meet with Mark and disclose the information, leading to Mark being shocked and hurt, and Jane reacting with extreme anger.

AITA for Telling My Sister's Fiancé About Her Secret?

I (28F) have a sister, Jane (25F), who has been engaged to Mark (27M) for about a year. They’ve always seemed like the perfect couple, and their wedding is coming up in a few months.

However, there’s a big secret Jane has been keeping from Mark: she has a 3-year-old son that she gave up for adoption before they met.

Jane and I have always been close, and I was there for her during her pregnancy and the difficult decision to give up her baby. She made me swear never to tell anyone, and I’ve kept that promise for years.

But recently, I started feeling guilty knowing that Mark has no idea about this part of her past.

I brought it up to Jane a few weeks ago, suggesting that she should tell Mark before the wedding. She got furious, saying it was none of his business and that it would only cause unnecessary drama.

She reminded me of my promise and said if I told him, she would never speak to me again.

This has been eating at me, and I finally decided I couldn’t keep it from him any longer. Last week, I met with Mark and told him everything. He was shocked and hurt that Jane had kept such a big secret.

He thanked me for telling him but also looked devastated.

Now, Jane is absolutely livid. She’s called me every name under the sun and said I’ve ruined her life. Our parents are divided: my mom is on my side, saying Jane should have been honest from the start, while my dad thinks I betrayed my sister and should have stayed out of it.

Mark hasn’t called off the wedding yet, but he and Jane are currently not speaking to each other. I feel terrible about the pain I’ve caused but also believe Mark had a right to know the truth before marrying Jane.

Here’s how people reacted:

Conscious_Rich_1003

EHTA (did I do that right? Everybody here is the asshole) Not your business, and honestly isn’t something he Mark needs to know so you are the asshole for thinking you need to be the god of all information. Mark is an asshole because of the fact that your sister didn’t feel comfortable telling him about the adoption. Your sister is the asshole for not embracing something that was a really good thing that she did and then not telling the most important person in her life. Mom is an AH for siding with you. Wait, dad sounds pretty cool. Dad’s not an asshole I don’t think, but he might just be guilty by association.
Professional_Ice4866

This is definitely something Jane should have told Mark in person when she was ready. Judging her for giving up her baby is also not Mark’s right. It happened before him  and this is what your sister will live with. Should Mark know ? Yes. I would like to know if my partner got kids or not, but that should have been told by the partner, not ” flying monkeys”. You overstepped the boundaries and I think your sister will go nc with you. This is not the situation when family tells the man about a bany bc your sister neither had an affair, nor this situation helps in anyway her relationship. EsH
YouSayWotNow

YTA

I understand how strongly you felt that her fiance deserved to know, and I agree with you. But it wasn’t your place or choice to tell him. This isn’t a case of her cheating on him, it’s a personal decision of hers about whether to share or not something that is firmly in her past.

Personally, I agree that secrets of this nature should not be kept from one’s spouse BUT it’s up to the individuals within that relationship, not others outside who see things differently.

She should have been honest with him, absolutely.

But you should not have overriden her by telling him yourself.

Luna_michie

NTA. While it’s understandable that you felt conflicted about keeping your sister’s secret, ultimately, Mark had a right to know about such a significant part of her past before making a lifelong commitment.

It’s natural for Jane to be upset and feel betrayed, but her anger is misdirected. She should have been honest with Mark from the beginning, and her refusal to do so put you in a difficult position.

It’s now up to Mark and Jane to decide how to move forward. You did the right thing by being truthful, even if it was a difficult decision.

BriefHorror

NTA I fully understand I’ll probably get roasted until the cows come home but she’s lying about a whole ass child. That child has a very good chance of just turning up randomly like 15 years from now. That would be something I would want to know and based on prior reddit posts that would be something a lot of people would want to know. I would be extremely pissed to wake up one day and the kid my spouse never felt like I should know about popped up. That is a whole lack of trust and she shouldn’t be marrying someone she can’t be honest with.
throwitaway3857

YTA, an idiot and a shit sister.

He did NOT need to know. It was NONE of your business. It’s none of his. It wasn’t his baby, it didn’t concern him.

Do you want Mark? Is that why you did this? Bc this act reeks of jealousy and insecurity. Is it bc you’re older and not getting married?

How trashy. You asshole.

I hope you get this repaid back to you ten fold and someone destroys your happiness over a decision you’ve made in your past. What a horrible thing to do to your sister.

United_Fig_6519

NTA this is the kind of thing her fiancee should know about. This is not a little secret. It will come out one day…when they plan family and doctor ask her has she been pregnant before, had children prior…is she going to lie or keep him away from those appointments…..or when they have kids and they want to do ancestry etc…and surprise they have half sibling….no…she should be honest and tell him. She should have told after dating him early on.
BlueGreen_1956

Tough one.

This is something your sister should absolutely have told Mark before the wedding.

If SHE found out after the wedding that Mark had a son out in the world somewhere and Mark had never told her. every post here would be crucifying him.

I suspect your sister will not get a similar bashing.

Such is Reddit.

RespondCold252

YTA
Not your circus, not your monkeys. Why do you value Mark’s needs (“I couldn’t keep it from him any longer”) over your sister’s needs and what you promised her? What is your connection with him?

I am not going to question if he needs to know the adoption or not, but in any case it wasn’t your turn to tell him.

countryboy1101

NTA and you are correct that she should have been honest from the start with her STBH.

I think I would have searched for a way to let Mark know about this without directly telling him. Sent him an email from a burner account or send a letter that the child is trying to find her or something.

Gothic_Enigma-

NTA (not the a\*\*hole), but perhaps you should have planted the seed in Mark’s mind rather than destroying the entire field. In either case, you have obviously stirred the pot, and now it is time to sit back and watch the drama unfold. Grab some popcorn!
Gold_Particular_1587

I say NTA. While it is unfortunate that you had to tell, I believe Mark had a right to know before marriage. If I were to marry a man and then find out he fathered a child and failed to disclose that prior to the wedding, I would not be happy.
ItaliaEyez

Who the hell are you to do that? Ever think MAYBE she has a hard enough time coping with this?

People like this are why some women choose to terminate a pregnancy in secret, even when they don’t want to. Fear of what may come later.

Ok_Original_9063

can you imagine what the result would have been if after marriage her husband would find out? Even though it was before him it could really be fatal to marriage due to not telling about giving birth and not telling.

update me

Own-Setting-1562

Definitely, YTA, it was NOT your business at all, and the fact your sister asked you not to tell anyone, then you intentionally tell him?!

Look what you’ve done. I hope you learned your lesson to mind your own.

Mindless_Baseball426

YTA, she doesn’t have a son, she had a baby and that baby got adopted. It’s someone else’s son now. This was absolutely not your story to tell and none of your business. I hope she never talks to you again.
CheezeCupcake

YTA. Mark did deserve to know. And your sister should have told him long before a wedding. But that is between them.

I never understood how the guilt of other people’s secrets “eats them alive”.

beAutifuL_theA

Even if your intentions were good, the way you handled the situation was wrong. It’s important to respect people’s boundaries and their right to disclose personal information on their own terms.
Contribution4afriend

YTA the kid was safer away from you and your tactics. You did this on purpose to gossip not for health mental care. Was it too much that she was moving on with her life? You had to ruin it?
amyloulie

YTA. Your sister is the only one who had the right to decide when or if she shared one of her most vulnerable moments. I’m not saying she was right, but it wasn’t your place at all.
ApricotFlimsy3602

NTA no fault in being honest to someone if hes being deceived, all the YTA people here liars that want to hide their wretched past from others and not be judged by their actions.
BKRF1999

NTA. This is not something you hide from a partner. This kid will seek out his mother. Devaste him now or devastate him later, he will find out.
Gohighsweetcherry

YTA His was it your business to tell him? Exactly it wasn’t you’re just jealous and interfering. I hope they get married and uninvite you.
Gloom_Goth-

It seems that your sister should start organizing a different kind of surprise wedding, one in which her background will remain a secret.
ImaginaryScallion371

NTA, anyone who says otherwise just want to lie to their partner.

She should of not build a relationship on lies, its on her not you.

Dipshitistan

YTA. Your dad is right, and I hope your feelings of self-righteousness are a comfort to you now that you have no sister.
Old_Web8071

If she kept something like that friend m him, what else is she hiding or will hide in the future? I’d drop her.
Wichdhwlwbrvekekbe

YTA. You’re really weird for dictating what you think your sister should disclose to HER fiancé.
Useful_Context_2602

YTA. Always amazes me when people think it’s ok to interfere with other people’s relationships
thejackalreborn

YTA – it absolutely wasn’t your secret to tell. You’ve created so much drama
Unpleasant_Advice

YTA. It was none of your business, and you did break your promise.
professionaldrama-

YTA 

So Mark was more important than losing your sister to you.

joe-lefty500

YTA You’re close to your sister? Ha! Not anymore.
TranslatorWaste7011

YTA and that is not going to make Mark want you.
GorditaPollo

Yta geez man let a woman have her past. 
Turbulent_Ebb5669

Well aren’t you the righteous one

Conclusion

The narrator is currently feeling distressed by the pain caused to her sister and the resulting family tension, but she maintains that she acted correctly because Mark deserved to know the truth before entering a marriage with Jane. The central conflict lies between the narrator’s duty to uphold a promise of secrecy and her belief in honesty, particularly regarding major life events that affect a future spouse.

The core issue for debate is whether the narrator was justified in breaking her sister’s confidence to ensure Mark’s right to informed consent in his engagement, or if the narrator overstepped by interfering in her sister’s relationship and violating a deeply personal promise. Was the potential damage to Jane and Mark’s relationship worth the revelation of this past event?

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