Alexander "Alex" Michael Wayne Deuyour is an American-born English wizard who was born while on vacation at Disneyland in Anaheim, California on September 24, 1979 to Desiree Deuyour (née Black) and her husband, whose last name was Deuyour. Deuyour was killed during the height of the First Wizarding War, being killed by Lord Voldemort himself. When Alex was born, only his mother, father, and godfathers Sirius Black, Remus Lupin, Severus Snape, and James Potter were there. Desiree went to Hogwarts when from 1971 to 1978 and was the adopted sister of James Potter and member of the Marauders as a Gryffindor. Her older brother was Sirius Black, making him Alex's godfather and maternal uncle. Although she ran around at the age of 16 along with Sirius, she was not disowned by the family. When she was married to Alex's father, she lied to her parents Walburga and Orion about her husband, claiming that he was a pure-blood, when he was in fact a half-blood. Neither discovered this fact in fact. Desiree was upset when she discovered her younger brother Regulus was killed by Voldemort. When Alex was three months old, a prophecy was named about him and Harry Potter as the prophecy said that he would help a boy, either Harry or Neville Longbottom, both of whom were his second cousins and godbrothers. Desiree was upset when James and Lily Potter, her close friends, were killed, but unlike most of the wizarding world, she did not believe Sirius betrayed them as she was told that Peter was the Secret-Keeper.
Alex spent most of his life being taught that blood purity didn't matter. Desiree desperately tried to keep connections with her family, but with the exception of Andromeda Tonks, her husband Ted, and their daughter Nymphadora, none of them wanted contact with her. Alex met and became friends with Ron Weasley when he was three and went to the Muggle primary school St. Gregory's, where he met his godbrother Harry Potter and his cousin, Dudley Dursley. Alex did not tell Harry of their relationship until he went to Hogwarts as well but stood up to Dudley. He was often beat up for this but he did use his magic to stop the beatings.
When Walburga died in 1989, Desiree was made Heiress to the House of Black. She disowned Orion for his cruel mistreatment of Sirius as a child, and he died in 1990. She reinstated Sirius to the family tree and disowned Bellatrix Lestrange for being a Death Eater. She made a law stating that if anybody in the family were affiliated to Death Eaters, they would be removed from the family. Lucius and Narcissa were subsequently removed as well. Among those reinstated were Andromeda, Sirius and Desiree's uncle, Alphard, the Longbottoms, and the Weasleys, something Walburga and her loyal house-elf Kreacher were displeased about.