There is a neat phenomenon whereby most humans, if you nag them with facts, will just get that much more entrenched in their stupidly held beliefs.
That is: the more you nag him, the LESS likely he is to listen and the MORE likely he is to stick with what he already believes.
Conclusion: You said your piece, you’re not going to change his mind. Now, let it go.
You can’t convince nor fix stupid and he’ll have to learn the hard way. Sadly, his daughter will be the victim. That’s life.