Over the past month my 4yo DS's behaviour has gone rapidly downhill.
He was always prone to the odd tantrum/stubbornness, but was generally thoughtful, gentle and lovely. But recently he's become cheeky, rude, more stubborn, very physical (jumping off things, slamming doors, fighting DD) and generally very demanding. Things must be done immediately or he strops, DD cannot touch any of his stuff, and he has been very demanding (shrieky, boisterous and rude) when we are out.
I'm trying to be firm re. punishments (predominantly being sent to his room) but he doesn't seem particularly bothered. E.g He will say 'how long do I have to go to my room for' I'll tell him 10 minutes missed TV spent in room, and he'll just say 'that's not long', and go and sit in his room, then come down completely unrepentant.
I remember going through similar-ish with DD (who is still quite stroppy and strong willed tbh - which doesn't help with sibling fighting), and I think reward charts helped a bit IIRC.
Any recommendations? I can't help thinking he wouldn't give a shit about a reward chart! Thanks.