Although it won't happen quickly, there are steps you can take to help the children learn to share and develop compassion and generosity.
In your own interactions with your child, consciously demonstrate and describe sharing. For example, at snack time, say, "Let's share this muffin. Here's a piece for you, and here's a piece for me." Or, when building with blocks, say, "Here, you take a turn and put this one on, then I'll put one on. We're sharing the blocks."
Model sharing in your own behavior with others. At home, look for opportunities to share things with your husband. Or, when you and your sister are together, make it a point to do some sharing, describing it as you do so. Three-year-olds are great observers and imitators!
Recognize and praise sharing behavior whenever you see it. (Or, as I often say, "Catch them being good!") A simple, "Oh, I like the way you're giving your cousin a turn!" will probably make both children eager to get that positive attention from their mother and their aunt.
As the children get older, encourage perspective taking--seeing through another person's eyes. For example, when you see them getting into a battle over something, ask them questions such as, "How do you think he feels when you won't let him play with that?" or "How do you feel when someone won't share their snack with you?" Perspective taking is an important step on the way to genuinely caring relationships with others, in which sharing becomes the natural and comfortable thing to do.
Editor's note: Dr. Martha Farrell Erickson, director of the University of Minnesota's Children, Youth and Family Consortium, invites your questions on child rearing for possible inclusion in this column. You may fax them to (612) 624-6369 or send them to Growing Concerns, University of Minnesota News Service, 6 Morrill Hall, 100 Church St. S.E., Minneapolis, MN 55455.