It says monster daughters will go after their fathers but then how are there any single monsters left? Can you avoid marrying your daughters?
Yes, let her interact with other boys her age.
But how do monsters become adults and still be single if they have to interact with boys or marry their dad as kids?
You're both kinda wrong. They will mark a boy they like as a future husband. So when they're older (about 15-16) then she will then have sex with him. Until then she will remain very close friends with him.
What do you think?