For the time being just tell him UH UH in a very stern voice & put him down.

Ensure that you do not have their toys lying around all over the place. Keep them in a box and you decide when they play with what.

Start making him "work" for stuff. Teach him sit and make him "sit" for any rewards like dinner or fuss.

Book in a training class. Sure he is just pushing his luck and will soon realise you are the boss