Having her real father in imprisonment in azkaban and no mother figure, Sophie was given over to the ex-bestfriend of Sirius Black, Sophie's god father, Remus Lupin. She always asked to change her last name to Lupin but Remus always said no, not being his child. He was always a father figure to her, sometimes she wishes they were blood related. Remus always told her Sirius wasnt a good man, having handed over the Potters to Voldemort and spending his life in azkaban as a mass serial killer. Everything changed in her 3rd year at hogwarts, her father escaped azkaban and was after the famous Harry Potter... thats what we thought. skip a year and Sophie had her real father back, finally letting her surname be known as her own. She was Sophie Black. they moved to Grimmuald Place with her father and the weasley family. Harry joined them and thats when her existence went to shame... they forgot she existed... She wanted her godfather back as her guardian as soon as Harry walked through that dammed door.