Disney Mermaids Ariel and her Little Mermaid Sisters Aquata and Andrina swim underwater in pool! These mermaid Barbie dolls are from the Disney The Little Mermaid movie. Ariels sister are Aquata and Andrina. Both mermaid dolls fins move in the water. The Disney mermaids swim in the water and hunt for human treasures. They pull from the water Barbie accessories like food trays and a purse. Aquata and Andrina can be seen in the Disney Little Mermaid movie when Ariel is meant to sing the Daughters of Triton song with Sebastian leading the music. Ariel is a Disney Princess and her boyfriend is Prince Eric.