DS 4.6. Adores Superheros and all that type of thing. Watches TV and cartoons, but has never seen a live action film EVER, except 'Enchanted'.
ALL DAY his language is really, really violent.
Everything is "I'm going to kill you" or insults of Poo-Poo head or Big Fat Tummy head etc...but that's not as bad as the rest of it - to his 3 yr old sister, "If you do that again, I'm going to smash you in the face/throw you out the window/cut your head off/stab you in the eye" - now, I have explained it's not nice, will hurt people's feelings etc...and of course, just plain gone mad at him but it makes no difference.
He has been doing this for over 3 months now. Even when he's in a good/happy mood, it is still the same.
Any suggestions, or similar experiences please?! It really is doing my head in!