When the brother failed to return the items on a subsequent meeting, the OP escalated the situation by telling their children that anything in the brother’s house would be ‘fair game’ if the Lego was not returned during their next visit. This resulted in the OP’s children taking numerous items from the brother’s home, leading to a major argument. The central dilemma for the OP is whether their method of retaliation, mirroring their brother’s initial disregard for property, was justified.

My brother and his family came for a visit last month. My kids and I play with lego and we have fun leaving little dioramas around my house. Just silly stuff like a fight between Ironman and Darth Vader on the loot llama.
It’s just our way of leaving Easter eggs around the house.
My nephew really liked them and decided to take a few home. When we noticed they were missing I asked my brother to bring them back. He said that it was just kids being kids and that he would them back the next time we saw each other.
I saw him for coffee and I reminded him beforehand that I wanted all our stuff back. He “forgot” to bring the “toys”. Okay. Game on.
We went over to his place for a BBQ. I told my kids that unless all our stuff was returned to us when we got there literally anything in the house was fair game. Like the godless barbarians they are they went to town.
When we left I don’t think there were any remotes, small electronics, or beer mugs left at his house. I actually had to sneak the dog back into the house before we left.
I started getting calls on our way home. I ignored them.
When I got home I returned his calls. He said a bunch of stuff was missing from his house. I said I would check with the kids. He said that I fucking well knew what happened and that he wanted his shit back.
I said I would box it up and return it the next time we saw eack other. As long as we got our lego back.
He was at my house with my Lego later that evening. He had even accidentally included stuff that wasn’t ours. I returned it and his stuff. I told him that this is how we would be dealing with his kid in the future.
He is pissed off that he had to make a special trip to return my stuff. My parents think that there is a huge difference between an eight year old taking Lego minifigures and a couple of teenagers pillaging their uncle’s house.
AITAH?
Conclusion
The conflict centers on a clash between the OP’s need to enforce boundaries regarding personal property and the brother’s dismissal of those boundaries when they involved his child. The OP chose direct, reciprocal action to enforce a standard that the brother initially ignored, resulting in mutual loss and significant anger.
The core question remains whether enforcing a boundary through direct, proportional retaliation—even if it involves children—is a necessary step when polite requests are ignored, or if this action simply escalated a minor issue into a long-term family feud. Should the OP stand by their method, or was the scale of the retaliation inappropriate?
Here’s how people reacted:
Was it petty ? Yes
Was it kinda an AH move yes
Did the brother deserve it ? Absolutely
The stuff should have been returned immediately when you brother realised his son took it , he had multiple opportunities to make it right. This was a perfect opportunity for a teaching moment for his son and he completely failed as a parent, I bet he didn’t even speak to his son about it.
Of course there’s a difference. One is much, much funnier.
Brother is old enough to teach lesson to his son not to take things that do not belong to him.
Is it like a 20 minute run to the grocery store, or a 6 hour cross-state drive?
Also your house sounds like an excellent place to visit!
UpdateMe if there are more shenanigans 🤗
Nta