...and boy, is Bud mad!
It's your classic story. It's just dad and us boys, and God forbid any woman comes between dad and the boys! Bud isn't into girls yet so he can't quite understand why is father would want to have anything to do with the creatures. He still loves his mother, and the thought of anybody replacing her just borders on crazy.
To be quite honest, I did not like this woman. I think Po should have been a bit ticked off on the way she acted around Flipper - especially considering the fact that Flipper IS part of the family. I thought that was quite insulting...Of course, I suppose she's pretty enough that Po doesn't want to risk ticking her off or something.
The ending was sort of...uh...strange. I thought it interesting that the girlfriend jumps in after injured Bud, but not the father. He calmly watches from the boat while the son he loves could be drowning...