Which 1D member has a sister called Gemma?

Explanation

Harry Edward Styles (1st February 1994) is known as "The Flirt" in One Direction. He enjoys having curly hair and likes the attention it gets from girls. Harry has many talents including juggling and is usually the main singer for every One Direction song. He was in a band called "White Eskimo" before One Direction and his first pet was a dog named Max. Before he took part in The X Factor he had ambitions to become a lawyer.