This is my take on the merdanny fanfic idea.

The Fenton's live on a group of islands called Amity. It's just off the west coast and is it's own isolated country.

Danny's parents study unnatural phenomena in the ocean and decide to move there due to a multitude of strange sightings in the waters surrounding the small cluster of islands.

They purchased a small island just large enough for the house that was already there, plus a small yard. There was a personal dock and a bridge connecting them to the main island. There were many of these bridges connecting the various islands of Amity together.

They have a super high quality basement that was originally used as a hurricane shelter, but was converted into a lab when they moved in. The lab is used to study the numerous abnormalities in the surrounding waters. The main use, however, is to work on inventions, experiments, and theories involving merpeople.

Jack and Maddie Fenton are firm believers in merfolk. They have one wall of the lab dedicated to their research, sightings, and mythology concerning mers. Another wall, however, is where they are building their most groundbreaking invention yet, the Fenton mer-portal.

And so, our story begins, with Jasmine (Jazz), Danny's older sister, and Danny, sitting in the lab, waiting for their parents Jack and Maddie to unveil the finished Fenton portal.