While very much not a canon character, Beat acts as the furthest point in Goku's recorded family tree to this date. Dragon Ball tells the tale of a young warrior by the name of Son Goku ...

The fighter is the son of King Vegeta ... so Vegeta can add being a big brother to his resume. Finally, Goku’s family tree is the most fleshed out. The Saiyan was born to Bardock and Gine.