Golene is Goku's long lost sister. Her Saiyan name was Kakarotte but her storyline of how she turned to the good side was far different from Goku's.
Kakarot is born normally except that he had a twin sister with a similar power level and similar potential. Her Saiyan name is Lettuna (Had to keep the Vegetable naming theme). They both end up on Earth and are found by Grandpa Gohan and are renamed Goku and (I had trouble with this one) Gokina.
Goku was born on Planet Vegeta as the second and youngest son of Bardock and Gine, making him the younger brother of Gine and Bardock's eldest son, Raditz.
Gine (ギネ; Viz "Gi-ne") was a female Saiyan, the wife of Bardock, the mother of Raditz and Kakarotto (better known as "Gokū").
Xicor, Goku's 3rd and Strongest Son.
In the very first chapter of Dragon Ball, the male protagonist introduces himself to the female protagonist as “Goku” with a direct follow-up to that: his full name is “Son Goku”. In typical Japanese fashion, the family name here comes first (“Son”) followed by the given name (“Goku”).
Gohan is introduced as the first son of the protagonist Son Goku, and his wife Chi-Chi, in chapter #196 "Kakarrot", published in Weekly Shōnen Jump magazine on October 8, 1988. Gohan as he appears during the Last Hero Standing! story arc in the Dragon Ball Z manga. Art by Akira Toriyama.
Dragon Ball Z is where the meat of the series takes place. Five years after the events of Dragon Ball, Goku is now 23. He's now joined by his five-year-old son, Gohan.
Every single member of Goku's family has died at least once. His mother, Gine, died when planet Vegeta exploded and his father, Bardock, died when he was disintegrated by Frieza's supernova attack.
Brother or Half-Brother
Raditz is Goku's brother, as stated by him. Also, he doesn't have to look like Bardock to be his son.
Son Goku is the main character in the Dragon Ball series. He is found and raised by an old man in the woods. Since he grows up in the woods as a male he uses particular language.
In the anime-only sequel series Dragon Ball GT, Goku is transformed back into a child by an accidental wish made by his old enemy Pilaf using the Black Star Dragon Balls while Pilaf was about to wish to take over the world.
The series ends shortly after Goku's climactic battle with Demon Jr (Piccolo) at the Strongest Under The Heavens Tournament, closing with Goku at age 19.
Story. Goku's eldest son, Gohan, is a polite little boy with dreams of growing up to become a great scholar. His name comes from Goku's late adoptive parent, who we know as Grandpa Gohan. Gohan was only four years old when he was kidnapped by Raditz while visiting Kame House with Goku.
Saiyans are all named after vegetables. Vegeta, both the prince, his father and the Saiyan home planet (originally named Planet Plant) is the first half of "vegetable". Raditz is 'radish', and his brother, Kakarot, is 'carrot'. The villain Frieza comes obvious, as well as his brother Cooler and their father King Cold.
After both Goku and the series experienced a 10-year time jump for the epilogue, Goku was now physically 37 and chronologically 44, while Vegeta also points out Saiyans' aging slows once they hit their physical prime to fight longer and more effectively.
She is an energetic girl who loves competition and a good fight; she's even shown to compete against herself, trying to beat records she sets. As a young child, Pan is innocent, and has to be warned by her parents to go easy on her targets, not knowing her true strength.
At the beginning of the saga, Goku told Bulma that he was 14, but that was because Goku's lack of education left him with an inability to count properly. After studying with Master Roshi, Goku became smart enough to at least know that 12, which was his actual age in his introduction, came after 11, and not 14.
The Western Supreme King Kai, also known as Freeza's mother.
In the end, Goku transforms into a Super Saiyan 5, and defeats Xicor.
Being half-Kai and half Saiyan and being son of Goku, Xicor is one of the most powerful beings in the universe. When Xicor makes his first appearance in Dragon Ball AF, he was shown to effortlessly destroy half of the Earth and defeat Goten with only a Ki Blast.