My mum dropped a massive bombshell that my dad isn’t my biological dad. Literally one night, when talking about her youth said he’s not your real dad than ran off! I was obviously stunned/upset but have a complex relationship with her & can’t really converse with her without her screaming & crying etc so I just left her house. My sister is braver than me & asked her questions on my behalf, just simply are you going to tell her anything else you can’t just leave it at that. Long story short, she’s now saying I’ve ruined the family by bringing this up, I should have ignored what she said, by asking questions I’m horribly ungrateful for the upbringing I had with my parents etc & has blocked me & told my sister she doesn’t ever want to hear my name again. My head is spinning. I actually don’t even want to go digging & find out who the biological connection is, I love my dad & he’s been around since I was 1 so is all I ever known. But I feel like I should be given the courtesy of being told my back story now she’s let it come out! Not to disrupt but it’s a box I can’t close now it’s been opened. I’m devastated. This happened to me, I didn’t cause it, but now I’m being cut off. It sounds insane & it is. I’m just looking for an outsider perspective as I can’t talk to anyone but my sister.