Mermaid abilities as traits??

I would like were you could have the mermaid abilities as traits and the mermaid swimming animation as a trait. (I'm creating a story where the son and the father split the mermaid kelp and the father gets the abilities (he's not a mermaid he's a human.) and the son becomes a mermaid but don't have the abilities at all, I would just put a mermaid tail on a human sim but the swimming animations for the humans kill me.)

I would like a trait for humans to mermaid swim. (glitching is okay cause I'll be putting a tail on the sim )

and I would like a trait where humans can have mermaid abilities (but there still human, of course lol)