DBZ

Vegeta Jr.'s true heritage is never revealed; Akira Toriyama simply stated in an interview in the Dragon Ball GT Perfect Files that Vegeta Jr. was a descendant of Vegeta and Bulma.
Vegeta Jr. is introduced in the last episode of Dragon Ball GT as Goku Jr.'s opponent in the World Martial Arts Tournament. The result of their match is never revealed, but both are seen to have the ability to become Super Saiyans, despite the fact that they are both less than one quarter-Saiyan.
Even though Vegeta Jr. is only seen for a moment in the series, his personality is seen to be reminicent of his ancestor Vegeta. He also physically resembles Vegeta, down to his upright standing hairstyle and widow's peak. However, Vegeta Jr. does not exactly resemble Vegeta when he was a child, as the elder Vegeta used to have a fringe.