Does Harry Potter have any relatives on his fathers side?

Harry Potter's father was called James Potter. James came from an old pure-blooded family with a fortune that had been built over the years. James' parents were older when they had him and he was an only child, which led him to be rather spoiled. His parents died before 31st October 1981. The Potter family are direct descendants of Ignotus Peverell and are in some way related to all the pure-blood families.

Harry Potter's mother was called Lily Evans. When she married she became Lily Potter. Lily was born to two muggle parents and she has an elder muggle sister named Petunia. Lily's family, with the exception of Petunia, were all dead before 31st October 1981. Her sister was extremely jealous of Lily. Petunia and her husband treated Harry like dirt when she raised him. Petunia and Vernon have a son named Dudley who is Harry's first cousin.