Is it normal that i hate my family of origin?

i'm 56 years of age. My entire life my mother has preferred my siblings - one older, one younger. She calls them the two girls - where am I in all of this? Nowhere. My aunt and grandfather figured this one out. They were like, why does she treat the other one differently? I'm like my Dad who was amazing. That's why.
My mother dropped by yesterday, her mobile rang. She spent an hour and a half at my place talking to someone else. She was rude to me and to my adult son. She could remember stuff about my older sister on the phone - nothing about me. That's normal.
I get so angry sometimes, the omissions are just about as bad as anything else. And my sisters whinge to me constantly about their lives. One has a partner and two kids, the other is single. Both are on a good income. I have four kids and have been a single parent for years, and they complain to me about their financial situation.