Mermaid to Human:
Because Ariel didn't kiss Eric before the third day at sunset, Ariel returned back into a human, revealing her true form to Eric. Before, King Triton hated humans and didn't want Ariel to have anything to do with them, but after Eric risked his life to save Ariel, King Triton saw the good in humans. Seeing how much Ariel loved Eric, King Triton decided to let Ariel marry him and he granted her legs forever. Not being able to return to a mermaid, Ariel says farewell to her Father, sisters and family, joining Eric on land where she has her daughter, Melody.