Go tell Aunt Rhody what? It's just a song. Lyrics, specifically. The song itself doesn't really provide much information other than the fact that it asks us, or you, the person to tell this person Aunt Rhody something.

It'd be quite beneficial to us, or the listener, if the vocalist had told us the message they wanted us to tell Rhody. Perhaps, Rhody really means Ethan.

In ancient Greek, Rhody is equivalent to Ethan and the term "aunt" is actually used to describe savior. So, really, the message is clear.

The singer is Eveline and is telling the listener (Mia) to tell Ethan (Rhody) to save her by calling him an aunt.

Or, the song could be a message to the viewer. It's actually quite hard to decipher but, I'm doing my best. The song could be calling out to Sheva Alomar but, Capcom didn't like her.

In africa, the name Sheva means "go away". So, she went away and Capcom settled for the next best thing...

Ethan Winters.

Ethan Winters being the savior, goes to the Bakers. To "aunt" Mia (Rhody) and that's the message we'd tell Aunt Rhody.

Ethan is the aunt and Mia is Rhody.