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The original was posted on /r/AmItheAsshole by /u/Electronic-Bear-7148 on 2023-09-01 17:02:41.

So I Kate 34 f have two kids 16F and 12M my ex husband is 38M Alex. Our marriage was ok but we were both different people in different places. He still acted very immature like we are 16 and kid less. About a year ago he married Mary 28F. She has a kid 1M from a previous relationship and her kid is sweet however I can see my kids be a little upset because Alex plays dad to this new baby but not even to his own kids. I think they feel betrayed like he doesn’t love them.

The main issue is when we started planning a trip for my daughter. She wants to go on a little family vacation to a beach. due to financial issues last year I couldn’t give her a big birthday so I told her this year we could do something big. She chose the place and a few activities and invites, I asked about if she was gonna invite her father and her response was “I guess but he is not gonna come he has the baby” my heart broke because I know she wants more quality time with her dad. She ended up inviting him and he sounded excited to come but now it’s two weeks before the trip he starts asking about prices so we could split it. I told him I’d be paying for me, our son and our daughter and he got really confused and started going on and on about how it was unfair to only include my kids and not Mary’s kid. I made it very clear my daughter invited him not even Mary or her son, but they are welcome to come however I would not be paying for them or sharing a hotel so there was no reason to spilt the payment. He mentioned the fact the baby won’t be able to do most of the activities so it would be cheaper for me but that’s not the case because if we split for example the boat tour then I’d be paying for the baby who doesn’t even know what’s going on. Now he is all mad and acting like I can’t possibly pay for all this with out him(I make more than him so I have no clue where this is coming form. So AITA?