Eros is your older brother, a merman, you are his little sister, but even though he is older, he doesn't have children yet, so your parents put you in line to be the next queen of the mermaids and mermaids and Oceana.

You had other siblings and you are the youngest of all, but you are still next in line.

he was dragging you back to the kingdom since you ran away (swam away) while they were swimming