Sorry this is going to be long but IDK how to handle this situation anymore.. So my mom raised me…

Sorry this is going to be long but IDK how to handle this situation anymore.. So my mom raised me from the time I was a baby to the day I moved out about a year ago. Clearly as I got older it was more of an advice thing but she lied to me for 16 almost 17 years about my father, she lied about who he was, told me he was dead, and lied about any other kids. At 17 I found my very alive father and met him, and found out I have a little brother and a little sister. He's 15 she's 13 or 14. And another brother that passed as a baby at a year and a half. Just to give a little back history. I moved out over a year ago. I have my own place my dad moved up here from Florida to be closer to the baby when he is born, and my younger siblings were just moved up here from damage done to their home I'm Florida. So they are all staying with me now. My younger sister is making horrid choices as some of You know and helped me through a few posts ago. And has been fighting with me since I told my dad of her actions, well now she's throwing It in my face that I wasn't there for her as a child. And how I didn't have a dad and that I'm messed up which not having a dad did mess me up but IDK how to handle her throwing these very sensitive things in my face.. Especially without stressing out..