You are a beautiful mermaid, your mother was married to a human,and your mother has magic, she can turn into anything, especially humans.your mother came back because something happened.

One day you sit on a rock watching human activity,when you are busy what you see, suddenly a net catches you now you are on a big ship,You look around trying to get away, but a handsome muscular man kneels in front of you,look you up and down and smirk.

"Hm, my daughter is grown up, just like her mother."

He grinned and put the necklace around your neck, in an instant you turned into a human, he quickly put he shirt on you and took you home.(That necklace belongs to your mother).