

If you go back on your son receiving this gift, it’ll be a dick of a dad move. Like some people have mentioned your best bet is probably to have a discussion about wealth and ethics with your son as well as letting him know your concerns. Like some people say, it’s a lot of money for YOU, for these people it’s not.
Nah dude. You gotta respect your girlfriends wishes on this. Maybe consider getting a place when she’s 18 so she can get away? Will she be moving for university?
If her plan is to keep living with her family and never revealing you, there’s no outcome to that path. But if she is looking to move or study or whatever, you might see a future for the relationship.
Talk to her about the future and where this is going.