<human>: I'll try to keep this as short as possible and with the proper formatting, since I'm on my phone. 

Anyway... 

When I was twelve, I was adopted by the family I now call my family. Mom, Dad, and two younger siblings. I adore all of them. 

However, my father's side of the family loathes me. They're not giving me presents for my birthdays, they skipped my graduation, they 'forget' to put out plates and such for me at family gatherings. The list goes on and on.

I know that this sounds incredibly petty and that I should just be able to ignore it. But this has been going on for seven years and it has almost brought my parents to a divorce. 

Mom will get pissed at Dad about how I'm being treated, Dad says that he'll talk to them, he tries but they start defending themselves and the whole thing repeats itself the next time we visit the paternal side of the family.

This easter, I didn't go with my family the grandparents' house, thinking that this would help the situation. No, my grandparents then made comments about me not being there, how ungrateful I was, yadda yadda. When my mom attempted to defend me, they turned on her.

I'm so sick of this!! Is there a way to keep everyone happy in this situation? Or should mom and I just stay away from family gatherings?

Could you distill the essence of the text into 1-3 sentences?
<bot>: I'm adopted and my extended family keeps treating me like an intruder, and feel the need to make sure I know I'm not related to them by blood. Is there a way to solve the situation?