I thought today was going to be productive in my relationship with my ex-wife and our co-parenting, because we were going to have a joint birthday party for our 3 year old son (it was rescheduled from last month due to weather)

My ex called me about 8am saying that our 3 year old son had thrown up (he had been sick on Thursday/Friday as well).  She said that I needed to pick him up and watch him while she took my 6 year old to the party with all the other kids.  I got offended and replied why aren’t you the one that staying home?  Ex responded that she done everything for the party and couldn’t believe I had the audacity to even suggest that.  I don’t deny that she scheduled the party and got the cake, but the cost was always agreed to be 50/50 and if she asked me to do one of those tasks I would have.  I was about to start a spin class so I told her I would call her back afterwards, party because I didn’t want to get into it by just reacting.  According to her I hung up on her.  In all honesty time was short, it was 8am and the party started at 9:50.  The venu was non-refundable.

When I called back she had already decided that she would stay home with our son and I would go to the party.  Since I had also thought about the situation, I explained that I’d be happy to stay with him, but she said no.  She then yelled at me (in front of our 6 year old) about how she shouldn’t have to pay me child support, and that she’s working too much right now so I should have the kids more days on top of the extra days I have (right now it’s a 60/40, but most of the year it’s 50/50). 

I went to the party and afterwards I picked up my 3 year old.  Fast forward to after dinner she asked how or son was doing.  I told her he had thrown up again, but he was in good spirits.  (It’s day 5, so he has to be through this already, RIGHT?!).  I told her if he ate and was normal tomorrow am I was going to send him to daycare.  She then proceeded to tell me he shouldn’t go to day care tomorrow and if I did take him she was going to tell the daycare he was sick today - which either makes me look bad or I have to deal with leaving work to pick him up,  To prevent some reddit hate, I had already decided to keep my son home.

She called and I did not answer and she directly texted me “so then you’ll keep him home”, to which I have not responded.  I can’t think of any response I give that won’t just play into her trying to push me around and be aggressive towards me.  AITA?  I”m hoping to wake up tomorrow with some reddit induced clairvoyance on if I should tell the ex that my son is staying home, or just continue to not engage.

TLDR: It’s a pain in the ass to share kids with an ex-husband or ex-wife.  It sucks being forever linked to someone you weren’t meant to be with.
