its a real tough one, you dont want to caus ebig agro but dont want to be bending over and taking it...
Id say key that f**kers car! then if he comes round to you, you can say he came here and started on me when he's laying on the floor k.o
on a serious note, i guess witht he family and all that you cant go mental, id go round have a word, say look if it was you, then leave it out, luckily its not an issue, but if it happens again.... if he blatenty lies to you, key the f**kers car and knock him out
get the on going theme