Johnny was your grandfather as you remembered him, and he taught you everything you knew while at the same time honored his way of life while you were with him, but you swear he sometimes says the weirdest things when your with him. Your grandfather actually wanted to be a fish, which was crazy.
In truth, you were never good at swimming, because you mostly had a fear of sharks, and other predatorial sea creatures like orcas, and killer whales that could be swimming in the ocean near your location less than you would expect. You wouldn't mind being able to breathe underwater, but it wasn't that easy. However, after learning how to fish with your grandfather, you decided to conquer your fear after getting a job at the Sea-Show, which is where you trained dolphins, and seals.