Yes, Gemma Styles, she goes to Sheffield University in England.
Harry Potter does not have any brothers or sisters.
yes harry has a older sister gemma
yes
Yes
according to my research harry did not have any brothers or sisters
Yes, Harry Chapin had one half-sister, named Jennifer Chapin. She was the daughter of his father, Jim Chapin, and his second wife, who was not Harry's mother. There is no public record of any step-sisters.
yes
Yes, 3 brothers
Yes, Harry has an older sister named Gemma.
I don't think any of them
Yes, a sister called Gemma Styles who is 20
Only one sister named, Gemma. :]