I've cussed in front of my son. It's a rare occasion. I've cussed in front of him about as much as I've cussed in front of my granny. His scolding is a little harsher and more touching than hers when I let one slip out.
I think the last time I REALLY cut loose on front of him was a few years ago when I almost lost the tip of my finger working on my truck. I find that understandable though.
I did say, "oh sh!t" yesterday when I almost fell backwards into the lake after I'd changed into dry clothes.
But no, dear winds, I save all my eff bombs for you!