The Little Mermaid's Sister

So everyone knows about the little mermaid, but what about her sisters? Avril is Ariel's purple-haired, teenage sister. What's it like living in the shadow of a famous sibling, mixed with normal teenage problems, as a mermaid? Read to find out ;D Ariel, king triton, Eric, and other things were created by Disney. I do not own those characters, just using them to enhance my story. Thanks ;p