Well I would give you background but tbh there isn't a huge amount of background that I personally know of.
Basically my mum and dad split up when I was just a baby and he's never really been in my life. He often didn't turn up for my birthdays or at Christmas. When he did he was always drunk and trying it on with my mum and she didn't want him around so told him to fuck off in no uncertain terms. I've seen him probably about 10 times in my entire life (I'm 26). My mum tells me that that family is all trouble makers, in trouble wih the law a lot, that my dad is an alcoholic and he tried to strangle her once, and that the only decent person in the family was his mother who sadly died. I wasn't invited to the funeral, I only saw about it in the newspaper. I've been completely ignored from that side of the family my whole life so haven't had a relationship with anyone. My brother, who unfortunately has been in and out of prison half his life, has connected with my dad and that family and he was welcoemd in with open arms but I've always been the odd one out. I always felt I wasn't missing out on much. The only two people I wish I had have stayed in touch with, however, was my half sisters and I often wonder how they are doing. My mum became friends with my dad's ex-wife when I was a young child and I met my half sisters quite a few times for play dates (minus my dad around) as a child. Then she left my dad (mum said he beat her up) and she moved away so I never saw my half sisters since they were tiny children (I'm 7 years older than the eldest).
She's now randomly added me on facebook as she wanted to see how I'm doing. I've briefly chatted to her on messenger but tbh it's hard making conversation with someone you don't know anything about beyond the basics (relationships, what jobs we're doing, if we have kids etc). So I suggested next time I'm around we should meet up. Do you think I should be weary?