If they're not on screens? I am struggling a lit with dc2 aged 6. To put it bluntly, he can be really unpleasant, rude to people, lacking manners, argumentative, back chat etc. (There are also lots if good things, but obviously I'm not here for advice about that!)
Both DC had more free time with screen over the holidays, some of it because I had to work (from home, with them here)
Dc2 is more reliant and obsessed with tablet/watching shite on YouTube etc. So we ate having a screen detox and omg us he moaning. I've given many many options. So many toys to play with, colouring, drawing, reading, playing games.
What do yours do? If it was summer he'd be outside.