My dd1 has the solution. She came up with it all by herself a couple years ago (she is 7 now). Her and her friend or cousin were arguing over toys. The other wouldn't share and she didn't want them playing with it so she brought the offending toy to me and said in a stern voice "right, we can't share so take it off us so no one can play with it".
Sent from my magical black talky thingy using BubHub