Albus Dumbledore had many mysteries about his family. He has a sister named Ariana and a brother name Aberforth. His dad is Percival and his mom is Kendra. Everything else we have no idea. He never talked about his family. His dad was sent to Azkaban because Albus' sister was attacked by muggles and so he attacked them. He later died in Azkaban. His mother and sister suddenly died. This eventually changed him. He would have never been the man he was before if those events didn't happen.