The headline makes absolutely no sense. The quality of writing here is nosediving.

Had similar dissonance. “How old could a 15 year old’s kid possibly be to date someone that was old enough to be a police officer?”

They pay you to write? Your grammar is atrocious. 

I thought it made it sound like the cop was dating his own daughter, but yes either way the grammar is just terrible.

You should fix your headline. The grammar is terrible. It makes it sound like the cop was dating the 15 year olds daughter.