Harry Potter and the Order of the Phoenix
by J.K. Rowling
Alphard was Sirius's uncle. He left Sirius a fair amount of money so that, when Sirius ran away from home at sixteen, he could support himself. When Sirius and Harry look at the Black family tree, Sirius notices that Alphard's name has been wiped off; Sirius assumes that it's because Alphard supported the family's worst black sheep.