My wife is not bothered enough to take the lead, but she does see my point. So if she won’t handle it, I will.
The kid and I were very close when he was younger, but we drifted as he became older and I started calling him on his stuff. His mother is more naive, so he tends to go to her for things because she asks less questions. He can’t get away with as much with me.
So any talk I have with him won’t be well received. But I don’t care.
You have a great idea to treat her like your daughter. I’ve found that when I talk to one of my own sons about not taking advantage of a girl, it goes down a lot smoother when I speak out of concern for the girl’s welfare.
After all my son likes the girl, too. He seems touched that I seem to care for her, too.
I think you owe it to both of them to take a stand, if not specifically from a moral basis (if that wouldn’t make any impact) then from a practical one. Assuming you just let this slide, what were you planning to do *when*, not if, she’s pregnant? Have her move in full-time, and all three of them living off you indefinitely?
I understand this is your wife’s biological child, but unless she’s also the sole owner of the house you’re all living in, you have plenty of authority to take action in the situation.