Son Goku is the youngest son of Bardock and Gine and younger brother of Raditz. Later he became the husband of Chi-Chi, father of Gohan and Goten and grandfather of Pan.
Over five years later after the defeat of Omega Shenron, Goku returns to Earth after training in the Dragon World with Wukong. He is reunited with his friends and family, and he even learns his son Goten is married and his granddaughter Pan has a boyfriend.
When Xicor, an evil clone of Goku, attacks, Goku helps Vegeta to defeat him, when he learns a new transformation, Ultimate Super Saiyan.
Year later he went back to the Dragon World, and he even took Pan, Tekka, Dennish, Yamato, Tami, Gohi and Toru with him, because Wukong received a vision that they would became great warriors.
At the Dragon World Tournament Saga, Goku wasn't part of the tournament, because he wanted to give the next warrior generation a chance to win.
Ultimate Super Saiyan: This form is a hybrid of Super Saiyan 4 and Super Saiyan Blue. Goku turns into this form, when he was battling Xicor. In this form his Super Saiyan fur turns blue, and he actually becomes more powerful than Beerus. The only weakness of this form is that it cannot be handled more than a half hour, due to its massive energy consumption.