It is possible that James Potter’s father was Charlus Potter. If Charlus was his father, James and his best friend Sirius Black would have been first cousins, once removed. Harry and Sirius, his godfather, would have been second cousins. Also, Harry’s best friend/brother-in-law, Ron and wife, Ginny Weasley would be his third cousins. Harry would also be related, albeit distantly, to the Malfoys, Longbottoms, and Lestranges.

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Facts about Harry Potter that you didn't know
RandomIn this book you'll finds some facts about Harry Potter characters that you probably didn't know. Enjoy! Disclaimer: I own nothing