My father was never really in my life and I found out that he had another family. He has 3 other kids.. All are older than me. My father died 4 years ago. I don't know if he told them about me. I found 2 of them on Facebook. I really want to know them and contact them, but the youngest of them is a senior in high school, like me. I don't want to shock them if they don't know about me. I know this was big news for me, but I am excited to have sibling considering I went all this time thinking it was just me, I just worry they'll be mad or unwelcoming. I mean what if only the older 2 know about me and the younger one doesn't? Should I try to contact the older one? Would it be wrong to spontaneously message them that I'm their half sister? Would they be mad that my mom was really the reason I didn't spend much time with our father? Even though I know he tried to see me and check up on how I'm doing, but my mom hid all of this from me.. It's not my fault for not seeing him, my mom kind of hid him from me even hough he lived just 30 minutes away. I just need advice on whether I should message them, and if so.. say what?? Has anyone ever been through something remotely close to this situation?