Goten and Gokuu

Goten didn't meet Gokuu until he was seven years old, and even then they thought it would only be for a day. Goten seemed a little uncertain of what to expect, and at first, hid behind Chichi... ...then ran out to get a hug from his daddy (anime only). Gokuu hadn't even known he had a second son until the Tenkai-ichi Budokai, but he did his best to get to know his son in the little time he had.

Goten developed a fair amount of respect for his father, like he had for Chichi and Gohan. Gohan would have told him a lot of stories about Gokuu (Goten said to Trunks that Gohan had told him Gokuu was the strongest in the world), and to finally meet him after all of that must have come as a shock. Also to be looking at a grown up image of himself, that would have been scary. In the manga it took Goten a while to get used to Gokuu, and he didn't show any kind of affection for his father until Gokuu had to return to heaven (and that was just too cute for words).

The anime and manga are pretty different when it comes to Gokuu and Goten. Gokuu and Goten seem to be a lot closer in the anime because they didn't have to cram so much action into so many pages per chapter. Particularly at the end of DBZ, when Gokuu goes off with Uub, in the anime Gokuu stops to say goodbye to Goten, Trunks and Pan, while in the manga, he leaves without saying anything to them. I guess Goten would have felt that his father was leaving his life again just as suddenly as he'd entered it.