I have 1 half sister, 2 stepsisters for sure. Most likely my half sister is my half sister because we have same mother but most likely different fathers because her dad (who I grew up with before foster care) had doubts about whether I was his kid or not. I still call him dad that's all I knew. So, she is either my half sister or my full sister. I also possibly have a half brother, not too sure, either. Long story, but he passed away recently. (So many people still ask me if he was my brother or not...I was asked that the other day even! And my dad is a liar anyway, so I don't even know for sure.)