Goten was born after the Cell Game and is Goku and Chi Chi's
second kid. When he was little he really looked like Goku. He is the brother
of Gohan and is 11 years younger than him. Goten was born during the 7 years
Goku was dead, so he was a little scared when he first met his dad. Goten
is a very happy hyper kid, and eats almost as much as Goku. He was taught
how to fight by Gohan and Chi Chi. He is best friends with Chibi Trunks and
is a year younger than him. They could both become Super Saiyans at an early
age. When Goku came back to life for a day, he taught the two kids the fusion
dance so they could fuse into Gotenks.
At the end of DBZ, Goten was dating a girl called Paresu, and didn't really
bother with any more training. He was supposed to travel with Goku and Trunks
in DBGT, but he was late, and Pan snuck on the ship instead.