What would you suggest I get ds to say to friends dc who keeps threatening to break his toys, or telling him they'll take his toy home (just to wind him up), and just tipping out toys without playing with them and telling him they'll do what they like. (ok this isn't all the time but can be frequent in 1 visit as a reaction to being told no to something)
I do say play with what you want but please pack it away when you've finished and then you can have something else out.
Told him earlier (in front of dc's mum) to say 'grow up your 5' then walk away.
in hindsight.