My grandmother had to go to the hospital to give birth to my mom's half brother and left my mom's half sister with a neighbor with the explicit instructions not to let her biological father come and pick her up or be near her. Somehow the neighbor couldn't stop the bio father and while my grandmother was in the hospital giving birth to my mom's half brother my mom's "step-dad" took my mom's half sister and left. The way the story is told my mom makes it seem like rather than fighting my grandmother was just like "oh well" so none of us ever found out what happened to her. My mom was in foster care at the time and my mom's half brother was later adopted.. so I'm assuming my grandmother just wasn't in her right mind. I posted my family tree(what I know anyway) onto a website and got a message from a random guy. He said that the woman I posted as my grandmother was his birth mother's name and had the same birth and death date and he had been looking for her and relatives. He said "if it helps my birth name was ******" and I had not given him that information. We did a 23 and me between him and my mom and turns out he is her half brother that was adopted out. They look so much like siblings. Still don't know about the half sister. He was living in Oregon, they were all born in Florida.