I often see that Z wants to share in the playing of a toy with M. She'll carry something over specifically for that purpose only to end up locked in a death grip over that toy, both of them crying and screaming. I'll admit it, sometimes I quietly laugh at the two of them. Once I even guffawed (only a little bit) when M unexpectedly let go her end of the toy which staggered Z. This is a new phenomenon at our house: G and BB didn't battle quite like this; BB and Z don't usually play together, and Z screams at the sight of BB just to save time; while G and Z together are amiable enough as long as G doesn't get too bossy.