My DP and I both have boys, the same age, from previous relationships. He's currently having custody issues with his X (We currently have majority custody, when I met him he was bringing his son up on his own, an agreement and schedule has been in place the last 6 yrs and now his X wants to rearrange it). My son has a birthday coming up, the party has been booked for over a month and is due to start at 4pm, finishing at 7. DSS is due to go to his mums at 5:30. In the past, my DP has taken DSS to all party's as the X isn't involved in DSS social/school life and if DP doesn't take him, he doesn't end up going. If a party ever falls during DSS's mum's time to have him DP and his X would arrange for DP to take him and drop him back off at his mum's.
Due to the latest custody battle's DSS's mum won't allow DSS to attend my DS's party during her time. As a result, DP has asked for me to change the time of the party, I explained that the reason it was at that time was that it was the only available slot, regardless he'd asked that I call and change the time. I called (knowing full well that we wouldn't be able to change the time) and there's no other time slot. DP has then asked that I change the day of the party now. My X and his son (my son's half-brother) don't live nearby (a 3.5 hr drive) and are travelling up for the party (his son doesn't live with him so he's had to arrange with the mother of his son to arrange to come up) invites and RSVPs have been sent and received and everyone is able to make the party. AIBU not to want to change the party as 1. It's on my son's birthday, 2. Everyone else has already replied to tsay that they are coming. 3. I have suggested that DSS attend the first half of the party (though I know that it would be difficult for him to leave, at least he wouldn't miss all of it)
My DP has now said that the party is no longer to be mentioned in the house or around DSS, especially on the day of the party (My son's birthday) as it would upset him to know he was missing out. He's also cross with me for arranging it at a time when he is due to go to his mums. (which was because it was the only time slot available and he has always arranged in the past for him to make all other parties)
I'm now worried that this whole thing is going to affect the enjoyment for my son on his own birthday - AIBU?