Goten is the second and last son of Goku and Chi-Chi.He his a Saiyan and a Human Hybrid.Goten was made to replace Goku so Akira Toriyama wanted to retire Goku from the series.Allowing Gohan to take command.But Toriyama was forced to put Goku back when the fans dissaproved of the decision to replace him.He is also Gohans little brother and Trunks best friend.