I found this pic and thought it's a cute idea

You're part of an other island far from Berk and you're the child of the Chief at your island.

Your father decided to visit Berk to catch up with the Chief there as they were friends and haven't seen each other much, at least not in the casual hanging out sense.

After awhile of being on sea, sailing on the island boat, you finally arrived at Berk. Your dad helped you down and onto the shore.

You got to the tribe's village and your dad met with Stoick the Vast, who had a son right behind him your age.

Seeing this as an opportunity, your fathers suggested you get to know each other.