Pippin was born in FA 8 (SR 1429) and was the fifth child and third son of Samwise Gamgee and his wife, Rosie (née Cotton) Gamgee. He had eight younger siblings: Goldilocks, Hamfast, Daisy, Primrose, Bilbo, Ruby, Robin, and Tolman.
Pippin's namesake comes from Pippin Took, Thain of the Shire, who was a part of the Fellowship of the Ring with his father. Funnily enough, his namesake later becomes his little sister Goldilocks' father-in-law after marrying Faramir Took.
Pippin was the last son that Frodo had prophesized for Sam.