With the recent release of Dragon Ball Daima, it is clear that the franchise is ever-expanding, telling new adventures of Goku and the Z fighters as they confront the biggest foes to save the day.
Turles isn't related to Goku, although an old issue of V-Jump and some localizations of the Tree of Might movie mistakenly stated that they're brothers. The reason Turles looks like Goku is that ...