I once left a girlfriend because of her family
I left a gf years ago for no other reason than the way her family was. They were a domestic train wreck. Always arguing, always asking for money, always at my house. There was even a time when they threatened she and I.
She knew how her family was and admitted to being embarrassed by them, but she refused to distance herself from them.
So, even though I cared about her very much and I knew that she loved me, I had to tell her it was over. She didn't take it well and asked if we could work it out, and I wanted to, but I just couldn't deal with her family.