S/O Annual Family Party
S/O's family throws a bday party every year for S/O's grandmother who passed away years ago. This year, the party falls on a weekend that FSD is supposed to be with her mother. S/O has decided that the party is more important than FSD spending time with BM and is going to take her to BM's house today like usual but pick her up at some point on Sat before the party. As some of you may remember me saying, S/O and I live miles apart so on his weekends with his daughter I stay with them at his folk's house and on the weekends she's with her mom he comes to stay with me at my apartment. S/O didn't even know that this weekend FSD was supposed to be with her mother until I brought up the subject (I have the schedule on my calendar at work). I wanted to know what the travel plans would be since the 1st is my mom's bday so I wanted to know what time drop off would be to see if he'd be coming to dinner with my family. One thing led to another and he ended up feeling like I didn't want FSD to come to the party just because I thought it was selfish of him to decide to encroach on BM's time.
I know there is nothing I can do but go along with the program but do you guys think I was out of line when I said that it's not fair for S/O to decide that he's going to take FSD on BM's weekend without even talking to her first?