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The original was posted on /r/AmItheAsshole by /u/bookish_stargirl on 2023-08-06 15:14:44.

So, my entire family is on vacation right now and a beach house my stepdad owns. This includes me (19F), my stepsister N(19F), my brother (17M), my other stepsister D (16F), my stepbrother J (11M) my stepdad (56M), my mum (54F), my stepdad’s brother S (53M), his wife (52F) and their three kids G (23M), X (20M) and M (15M). We’re a lot of people so there’s always chaos.

So, my stepbrother is a really spoiled kid. This isn’t something I say out of jealousy or whatever, he’s just genuinely spoiled. He has tantrums whenever something doesn’t go his way, he likes so hoard things people need for himself and refuses to give them back (think bags or beach towels that aren’t his) and is rude to everyone, especially my mum.

As a result, he argues a lot with my mum, his dad and his aunt and uncle. They sometimes yell at him, which is needed and understandable because his behaviour is really bad. However, sometimes when he’s not behaving badly they tease him about things he’s done and laugh about them to his face. They can act very immaturely, and it causes him to act out. Honestly, I don’t know how they expect him to not react.

Anyway, sometimes when he does things I calmly explain to him what he did wrong and how it made people feel and usually it’s all good after that. Today this was happening and I took him aside and spoke to him and it was fine. Later though, my mum and my step aunt came to me and said I had no business doing anything and they had it all under control.

It’s just that I feel bad for him. His dad never disciplines him, that’s why he’s so spoiled. The others just gang up on him and treat him like every word out of his mouth is a mistake. No one is looking out for him and no one is explaining to him what he did wrong without being condescending, so I thought I’d try and do that.

I know it’s not my place since i’m not his parent or even his actual sibling but I can’t see him like that and not do anything. So, AITA?