In an unseen timeline, Trunks travelled back to when Goku was a small child and accidentally killed him. As a result, when Oolong was terrorizing the Aru village, Goku did not turn up to save them.
You are Sherman Priest. This is your daughter. Oolong wants to marry her but she's like 7 and doesn't want to marry him. You also don't want to lose your daughter.
Beat the shit out of Oolong since he was a pussy. Obviously.
I THROW A ROCK AT 'EM
Wait for Porkers to get tired of those lolis taking advantage of him and come clean.