Storms' mother was a selkie. A mythical creature that sheds their seal skin to walk as a human on dry land. While his parents did fall in love, his father hid away her coat to keep her on land. To keep her "as the goddesses would want her."
Naturally, Fin showed traits from both parents. He is primarily human, however he also possessed his own coat at birth. His teeth and nails were sharper. He had webbed fingers and gills- All "corrected" by his father.
In Fins universe, its Trent who is the clockmaker. Its his clever idea to give his family a pocket watch- Containing a piece of their own coat inside. He had hopped by giving them a piece, it would distract them from the constant pulling ache of the coats he had hidden away.
But Lottie finds hers. Shes gone before she could attempt to find Fin's or formulate any plan to leave her human husband; Too scared to stop in case Trent found out.
Fast forward to Fin and Alice's final battle with Sileas atop the precarious cliffs of sirens gulf. Alice is possessed and Fin has no other options to stop Sileas. Slipping his watch into Alice's dress pocket, he shoves her off the edge after making sure both vessels are too badly damaged to make an escape.
Even with the watch, it takes Fin three days to search for Alice in the waters below.












