My 16 month old doesn't understand how to share at all. Whenever we have playdates, if another other child has a toy she will take it out of their hands and run away with it. If they get another toy out, she'll do it all over again. It doesn't matter if they're her toys or theirs. I'm not really sure how we can work on this behavior. She doesn't go to a daycare or anything, she's at her Grandparents house, so she's not around a whole lot of children, but it's so hard to take her over to friends houses to play when she's so mean. Any ideas on how to correct this behavior?