I hate my fiancé's family.

I posted a thing about a week ago about my overbearing mil. She wins yet again. I had plans set all week or more with my family for Memorial Day as both of my grandpa's were in war and one passed away. His fucking mom mentioned on Saturday that they were doing something and I told her and my fiancé we would not be there. So she has his cousin from out of town call and what does he do? Goes "we will be right over". No. No. No. I refuse to let her go. So he just up and leaves to go. He drops everything to go there but won't even walk down 20 steps to sit with my parents? We live in the same apartment building because it's easier on us all my mom had heart problems. I completely missed mothers day with my own mother because we HAD to go see his. She wants to control my whole pregnancy and not have my mom involved at all. I am done. Thinking of giving him my ring back. I can't win with this horrid woman.