I never heard my dad swear until I started working for him when I was 16. I was honestly shocked when we pulled up at the site in the van and he said to me and the other lad, "Right W4nkers!".
snap! I went to work for my dads business over the summer when I was 16 and I've never heard such swearing! He reserved a lot of it for danny who would *apparently* spend so much time in the dark room that it was clear he was up to other things.
My son swore at primary school once, the f word to another kid. Obviously it was all my fault (I do swear a lot but not in front of him) and nothing to do with the 5 or 6 blue eyed boys in the same class who I'd heard effing near enough constantly in the playground. The school pulled us in for the incident and when I suggested that he might have heard it from Robert or Alex, the headteacher nearly passed out and spat 'robert and alex do not swear!!!!!!!' at me (because robert and alex and their parents go to church whereas we didn't).
I then suggested she might want to listen to them in the playground, which I presume she did because we heard no more about it. And my son never swears now (near us anyway).