Boys copy their fathers from a young age. I have seen it with my own child. If I yell at the dog, a few minutes later, he yells at the dog. I, like most parents let out the occasional swear word. I do it quietly when I am driving for example...but my son hears everything and he repeated the F word once. I didn't go mad at him as he heard it from me so I explained that sometimes adults are stupid and not to copy my foul language.

It absolutely is the parents fault. No doubt. Some of the parenting just in my local town in the UK is shocking. 4 year old kids smashing bottles, swearing, spitting.

Some adults should be sterilized.