Can anyone offer some perspective, advice, brutal parenting criticism, reading we should do.
Short background if relevant (quite possibly not) - We've got a 4yo boy. He's had a lot of heath visitor contact in the early days as was displaying some odd, neurotic type behaviours over touching things which affected his eating. This seemed to more or less disappear although they offered referrals for autism, they very much left that in our court and we were fairly happy to leave it as he was doing great. We, and the HV, did attribute a lot of frustration to lockdowns at the time which was exceptionally isolated due to family circumstances.
At school he is apparently completely normal, very bright, polite, a little shy but nothing anyone is worried about.
At home he is making us absolutely miserable, he goes out of his way to wind us up. This can start first thing being poked, slapped to wake us up, refusal to eat breakfast or get dressed and sometimes won't walk to school. If he's told off (politely or shouted at) he reacts aggressively, he can throw things, spit in our face, make pretty sinister sounding threats about killing or hurting us or his sister
He's got a 4mo sister and he wakes her up, throws things at her, at us. He will hit us, scream, throw shoes. This is completely relentless from getting home at lunchtime until he goes to bed. This behaviour used to be reserved for mum and dad but he's also been awful with his grandad who is the most interested of all his grandparents. For apparently no reason he refused to speak or interact with him.
He's much better if we're out for the day, especially if it's just him with one parent, although will be horrendous if he's told no.
Discipline-wise we're at a loss. We've tried time-outs which have no impact, confiscating of favourite toys or cancelling trips, straight to bed, reward charts, reasoning, promise of treats. Nothing seems to be a deterrent or enough of a reward. I don't know what's normal for a 4 year old but he reduces both of us to tears on a regular basis. I'm not sure if my description of his behaviour has done it justice but we feel like we're constantly being worn down.
Where do we start? Books/websites? Professionals? If it's us needing to get a grip - what does this look like? Very open to advice.