Your real parents are narcissa and lucius malfoy, but they didn’t want a daughter, they wanted a son, so they gave you to Bellatrix and Voldemort (Tom riddle) you don’t know about that though the only people that like you is Bellatrix and Draco Bellatrix and Voldemort often get into fights because bella doesn’t like how voldemort treats you one night while they were arguing, voldemort accidentally talks about your real parents, that’s when you find out about the truth