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The original was posted on /r/AmItheAsshole by /u/DesstinSong on 2023-06-22 13:08:34+00:00.
So my dad has my sister (23f), my brother (21m) and me (18f) with our mom. They divorced when we were young because he wasn't very good to her. About four years ago he got married again and 2 years ago he and his wife had a daughter together. It bothers my dad (and his wife to an extent) that we are not all about their daughter and that we act like she's different to us. She's so much younger which is a part of everything but the main thing is he wants us to be invested in her as much as we are with each other. He wants us to be those much older siblings who don't want to miss out on much. But none of us feel that way.
She got a small surgery recently and dad was so upset that none of us insisted on being at the hospital with them. It was not a serious surgery at all and she was home the same day. But it weighed on dad that none of us were like "out of my way, we need to be there!!"
So my siblings and I have this sibling trip planned that sort of coincides with celebrating me graduating high school. Dad heard about it and proposed a change of plans to us. He wanted to pay for all of us (the three of us, dad, his wife and their daughter) to go to Disney or Universal for a week and that we could spend time with our half sister as well and have sibling time with all true siblings, not just us older three.
My siblings were all auto no's but I couldn't reply straight away so dad thought he had a chance (when I say I couldn't reply, I mean the app on my phone was being weird) and he was then messaging me alone and saying how it would be a good thing and how we'd have those memories forever and if we could make a tradition of it and she (half sister) would always know her big siblings enjoyed having her around. When I could reply I did and turned down the offer as well.
Dad is pissed and said it's not every day kids our age get the offer for a vacation paid for by parents and even offered spending money. He said it's like we're determined to make it clear our half sister is not wanted and we'll be the reason we're not close as she gets older, not the age gap and not him or his wife.
He told me I was acting like a kid and not like a new adult.
AITA?