It is a known fact the people are imitators. They will tend to return a smile for a smile. Over the years as I have walked in the neighborhood I have waved at everyone I saw driving by. Now I get people waving at me from almost every car that passes. How do we encourage our children to be positive? Be positive and they will imitate it. This may take more effort from some people than others but it can become a habit if we work at it. It's contagious.
Keep smiling, Kate.