It's never too late to help your children form a relationship.
Just because you're beyond the toddler years doesn't mean you've missed the window of opportunity to create a peaceful relationship between your kids. "It's true that you may have to undo some bad habits," Dr. Markham says. "But since your children are now more verbal, they're more able to express themselves in words. The only thing to remember is that if your child has built up resentment toward a sibling, you'll have to empathize with his feelings to help him express them to you, so that he can move beyond them and open his heart to his sibling."