they should help with tidying the mess up when its time to go home? I'm not talking about washing up and wiping down the surfaces here, just put the toys away that they have all been playing with and not by themselves asking my children to put the toys away too?
if my children make a mess when we go round to someone's house I always tell them to go and tidy up the toys they get out.
I think its the polite thing to do am I being unreasonable?