Everest by E.M. Leya

Family is everything to Everest, so when he finds out he has a seventeen-year-old son he never knew about, he is excited to meet him just in time to help him through his transition into becoming a merman.
Ky was happy to step up and raise his nephew after his sister’s death. He loved the kid as if he was his own. What he didn’t expect was for Shane’s father to step into their lives and change everything.
Introducing his son to the world of the mermen is exciting, but it’s also a secret they must keep from Ky. When the past comes seeking revenge, everyone is on alert.
With danger lurking, Ky and Everest must work together to protect Shane, while also trying to protect their hearts and secrets that could get them killed.