The earlier emotional education begins, the better. Being attentive to the social and emotional needs of your infants, toddlers, and young children is a great way to start them off and will make the transition to adolescence easier.

Build a language between you and your child which involves talking about feelings; describe your feelings out loud; ask how your kids feel; teach your child that he/she can have two feelings at the same time.

Look for teachable moments that occur naturally in your day-to-day life, moments that enable you to discuss moods, conflict resolution or managing feelings with your child.

Be aware that you can teach emotional competency through personal stories, current events, discussions of movies or web sites. Recognize and talk about prosocial and unintelligent social and emotional behaviors from these media.

Keep a journal which will help you to become more reflective about your emotional self and encourage your children to do the same.

Look for toys and products which are pro-social and build emotional competencies.

Sources
Social and Emotional Learning: What is it? How can we use it to help our children?
The George Lucas Educational Foundation