They have two. Gohan is introduced in the first episode of Dragonball Z, or the first Dragonball Z movie, depending on what you consider canon. Their second son, Goten, is conceived during the three-year sabbatical between the death of King Cold and the arrival of the androids. He is born after Goku gives his life fighting Cell, and is introduced to his father when Goku returns at the beginning of the Buu saga for the World Tournament.
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Yes. Goku has a second son by the name of Goten. However, he was dead when his son was born, and didn't get a chance to see him until Goten was 7 years old. Goten looks so much like Goku that Goku's first reaction to him was to ask why there was a 'little me' hiding behind Chi-Chi.
Goku's girlfriend is chi chi
Its one fight goku wont win. chi chi
Oh, what a delightful question! Goku and Chichi have two sons, Gohan and Goten. However, in some non-canon material, they do have a third son named Goku Jr. It's always fun to explore different stories and possibilities in the world of Dragon Ball!
The episode in which Chi Chi and Goku fight is episode 137. It's also the episode in which Chi Chi becomes Goku's fiancee.