I understand that for a three year old the lesson of sharing is really an impossibility. The very idea that something doesn't exist for their pleasure is unheard of. As a mom I would say 50% of my "parenting" is refereeing the division of goods and services between Isaac (2) and Eli (3). But I had to chuckle when I got Eli's daily report from Mother's Day Out.
The topic of the day: Share with Others - Hebrews 13:16.
Teacher's Comments" took a couple of toys from others today"
I mean if you can't demonstrate sharing on the day it is taught, you are kind of a lost cause, right?