Sister just had a party for our mom's 80th birthday without including me. Dear mom lives at home with my 83 year old dad as her exhausted primary caregiver.
I haven't been on good terms with my only sister for several years. She has an abusive husband, and seems to redirect the anger and hurt in every direction so I mostly stay out of her way. Mom just told me last week that sister decided to have a party for her on Sunday. Apparently a last minute decision to celebrate mom. Up until that day, mom was telling me she wasn't sure she was up to a celebration.
My husband was travelling out of town that day and I had made plans with friends. That day was bad for me. Mom said it could only be that day because sister's husband was gone the rest of the month. So they had the party without me.
What kind of a person does this? I'm mostly venting about the dysfunction, but I am sad and heartbroken. I feel like my sister is taking advantage of my mom's compromised status. How would you make peace with this?