What? No! Goku died twice, each one was in DBZ. Goku jr made his anime debut in a DBGT Movie, Goku Jr. was seen in front of Goku. Goku Jr. is Goku's great-great-grandson. His grandmother is Pan.
Gohan has a daughter, Pan and she had a son/daughter which was never shown, and her daughter/son had Goku Jr.
it is never revealed if goku has a cousin or not.
goku's last name is son but in japan last name is said first (example: Son Goku,Son Gohan)
Gokus Father is Bardock
Goku's father's name is Bardock.
Yes he does join Goku's team.
No,Superman can not beat Goku,Goku has power moves like supersain or as the kahmekahmeha,but as for superman his power can not match gokus
The name of Goku's mother is Kanza.
He doesn't have one, but his full name is Son Goku.
Goku turned into his great ape form and accidentally killed him.
No its how they call him in Japan Son-Goku -Giga Drill
goku jr it sounds stupid but for real it is you can find out on the last episode of gt and when vegeta jr fights him thats hes great great grand son but he does have a grandaughter named pan whois gohans daughter