Goten is the son of Goku
and Chi-Chi. He is like a minature Goku because he looks and acts so much like him. He and Trunks are best friends. Everytime that Trunks came over to play, him and Goten would fight because Trunks was training with his father so he thought he'd try it on Goten. They do the fusion dance to make Gotenks.
Because of the training that Trunks gave him he turns Super Saiyen at the age of 6 or 7.