I've not seen the first action you mention, but it sounds cute. So far all my peeps have married before adopting any kids.

I've seen the other two actions a few times. It does seem that 18 is the age when the peeps become adult. They also show a preference for whether they want kids or not when they turn 18 so theoretically I suppose they could have them.

I'm from the UK where the legal drinking age is 18 anyway, so it doesn't seem odd to me. In any case, they are drinking at home, rather than in a bar, so the law doesn't really apply, at least in my country.