Do you mean Jeremy Sumpter, the actor, or in the book? There is a sequel to Peter Pan, called Peter Pan in Scarlet written by J. M. Barrie's son.
_____________________________________________________
EDIT: The sequel, Peter Pan in Scarlet was not written by JM Barrie's son - he didn't have a son. It was a competition run by Great Ormond Street Hospital at the time of Barrie's copyright running out, and was won by Geraldine McCaughrean who then write the book.
In answer to the question: Peter Pan doesn't have a brother who appears as a character, but when asked why he didn't go home in Peter Pan and Wendy, he says he did, but the window was closed and there was another boy in his bed. Which implies his parents had another son, meaning he would have a brother, yes. However, it's not 100% as his parents could have moved and the boy could have been another child altogether, or he could have gone to the wrong house. This is the only reference in the book to any possible siblings, though.
Dominic Janes's birth name is Dominic Roque Janes Centorbi.
Dakota Fanning (the little girl from Charlot's Web!)
The name of Peter and Lois Griffin's daughter is Meg and she is the oldest child. Her brothers are Chris and Stewie.
Peter Hochmuth's birth name is Peter Brake.
Peter Tharos's birth name is Peter Panopoulos.
Dominic Janes's birth name is Dominic Roque Janes Centorbi.
Dakota Fanning (the little girl from Charlot's Web!)
His name is Alec and is the complete opposite to Jane; While Jane has a painfull gift Alec has a numbing gift.
Jamey Janes's birth name is Chanel Marie.
his name was peter Paterson his name was peter Paterson
Lauren Jane's birth name is Lauren Jane Sanders.
Peter Moore Smith
Jonas Brothers little Brother Name Is Frainkie and he is 9 years old
Horrid Henry has a brother called Peter.
billie
Peter and Andrew were brothers.
His little brother's name is Conner Hutcherson.