Yes and No
I have been known to tell him to shut up under my breath.
Today at Legoland I wasn't feeling great and he kept carrying on to his liking, so much to my shame I grabbbed him and hissed in his ear just shut up and do what you are told, first time I ever told him to shut up and then to my eternal embarrassment he announced in a very loud voice to DH and the queue, OOhhhhhhhhh she just said shut upthat's naughty isn't it Daddy.
Cue, one squirming DH, caught between supporting me and reinforcing the fact I had been sussed.
Ahh......... the joys of a 4 year old.