I have two older sisters. They are way older than me, which means they left for college when I was very young (when I was bout 5 or 6). I don't think they went through the same stuff as me, but still lived through a lot of very fucked up shit. We live in the same city and are very close, we see each other for their kids birthday and all of that. I'm very lucky to have them.
I know why my mother had me years later, because when my father was angry he would yell at my mother "it's you who wanted another, so take care of him", but with more vicious insults. It turns out that when my mother had her first pregnancy, she was supposed to have a son but had a miscarriage in the toilet. I think this pretty much explains her using me to satisfy her emotional needs all the time; I literally was her emotional garbage can. Telling me how she feels like an ATM for the family, how she's lonely and not taken seriously by others; things that a husband have to deal with, not a child.
So anyway, my sisters began to extended family members about what happened in our house when they were young and also of what happened to me. Like me, it probably took them years to unshame themselves and flip the culpability unto the abusers. It created a scandal I think in the extended family, although always very hush hush, as is usual in small rural places.
My parents probably got a word of what my sisters told about them and then when my oldest sister got her first child, it was actually my parents who stopped talking to them. They never told me why they stopped talking to my sisters, but we figured it out. For some reason that enraged my father and forced my mother to stop talking to them but not to me. After a few years I got tired of seeing them trying to play nice and burning bridges after bridges with other family members and family friends, and I decided to cut them off. Although my sisters never made any kind of ultimatum, I could see how my parents were throwing a wrench between my and my sisters by only talking to me and not to them.
There are more details to this sordid story. It really could make for a full TV drama episode; these people love drama and being the victim. Don't fall for their game.