You see how the kid has wings? It's because he's an angel; he's dead. When the mermaid mom had him, she killed him out of mercy (note the "LOVE" she had tattooed on her now empty womb and the heart on her obviously still lactating breast) because he was born with those horrible legs instead of a tail with a fin. He would have never been able to survive in the ocean on his own. She says she's his Juliet because she can no longer deal with the guilt and is committing suicide. She has beached herself and is now at the point of hallucinating the dead angel kid in her last moments.
You see how the kid has wings? It's because he's an angel; he's dead. When the mermaid mom had him, she killed him out of mercy (note the "LOVE" she had tattooed on her now empty womb and the heart on her obviously still lactating breast) because he was born with those horrible legs instead of a tail with a fin. He would have never been able to survive in the ocean on his own. She says she's his Juliet because she can no longer deal with the guilt and is committing suicide. She has beached herself and is now at the point of hallucinating the dead angel kid in her last moments.
(*that I just made up)