My experience from teaching is that you cannot teach those unwilling to learn, and the hardest to teach are those closest to us. I learned this long ago in training to be a trainer. Have you ever tried to teach your child to drive? Your spouse to fly? It is best to leave that to a professional disinterested party even if you also do it professionally yourself.
That being said, and meaning no disrespect because I don't know anything about you, but have you raised girls from age 13 to, I dunno, 30? I have no experience with boys myself, but my girls, from 13 to 17, (and up) were rebellious, and sneaky, which seems to be par for the course according to friends and acquaintances in similar situations. You can't be with them all the time and can't monitor their every move. Any of us could be that family, I'm just thankful my kids lived through that age without a major crisis, but there quite a few minor ones to be sure.
I don't want to say zero, but I'm pretty sure it's close. My now 25 year old actually apologised to us a couple years ago for being, as she said, evil, possessed, and a b!tch. They do listen, it just takes a long time for them to hear it. She now has two girls of her own, what are those curses, "may you turn out to be like your mother"?, or "may your children turn out like mine'? I dunno, I'm sure it's been tough for every generation to raise kids.
