exoticfruits - 'I find it amazing ...'
While a 16yo girl might be more responsible than a 16yo boy (can imagine fighting or somesuch 'tween an older boy and sibling(s)).
Plenty of people saw the BBC 3 series about parents observing ('snooping on') their 18yo offspring, away to Greece, Ibiza, etc with a bunch of friends. Parents observed them all getting drunk, and in one case visiting a lap dance club where son blew 250 quid in about 3 hours...
In another show, a 'quiet' lad (not as quiet as the one who blew loads of cash) was on stage while a girl who was bare to the waist was slowly removing his clothes... friends' jaws dropped as his dad and mum arrived, and mum dragged him off stage with a 'think that has gone far enough' comment...
She was, however, suddenly faced with the fact that he is a young adult and going off to university 2 months later, so she would soon have to 'let go'.
However the series shows the other poster is not alone in having strong family tie and it should be accepted as nothing more than that - takes all sorts (though personally I think it a touch too much 'cotton wool', so quite understand your view, too).