My mom has suffered from depression on and off for the last 30 some years of her life, so she was mostly checked-out. Never had a dad (he took off before I was born). My brother (15 years older than me) used drugs in front of me, sister (17 years older) was emotionally abusive from basically as long as I can remember.
I'm sorry for what you went through
having a not-so-stellar family isn't great. I feel like most the people I know (irl) have similar family situations. I don't know if that is just the type of people I attract, or if it is just a common occurrence to have a pretty messed up family, but either way it sucks to know so many people are affected by this.