Question about sharing toys/items.

So I just have one kid at the moment, but I babysit for a family with three kids twice a week. The kids are approx 4 years, 2 years, and 1 year. Their rules on sharing are as follows.1) Each of the toys belong to someone (no communal toys), so you must ask that person if you can play with them.2) If the person says no, you have to leave it alone.3) You may offer to "trade" toys if you wish and if both people agree.Well, last time I was there (I watch the kids while mom works at home, so she is there if there's ever really a tough situation), the 2 year old boy was screaming at the 4 year old girl because 4 year old was playing with one of his toys. Mom comes down the stairs and says to 4 year old "He asked you to not play with the toy, so leave it there."Meanwhile, the almost exact same thing (same kids, same situation) happened a week before, and the mom that time said to 2 year old "You can't just tell her not to play with something if you're not going to play with it yourself. Let her play with it."Is there an inconsistency there, or is it just me? I'm just trying to work out my own ideas about sharing, not only for when my kid has a sibling, but when he's sharing with these particular kids, and I don't know how to handle it because their rules don't seem consistent. via /r/Parenting https://ift.tt/2Ev9w6t