Praise Good Behavior
Catch your kid being good, and praise him accordingly. Sometimes, all it takes is positive reinforcement and encouragement to see kids repeating behavior that makes you proud. For example, if your kid helps his baby sister pick up her toys, say, "It's so great that your sister has such an excellent role model to look up to; thanks for your help!" By acknowledging your child's good deeds, you increase the likelihood he'll continue his positive behavior.