But, despite the theme song, we know that not every day will be sunny. Some are sad and painful, and Sesame Street is there for those days, too.
One in 20 children under the age of 15 will experience the death of a parent. When my husband Jay died, my daughters were just six and two.
I wish I had a resource like When Families Grieve to share with them back then. This special program which I proudly worked on with Sesame Street airs tonight at 8pm on PBS.
You'll meet children who had to face that first day without mom or dad, and all the days that follow and the grown ups who are trying to help them heal.
The death of parent is one of the most traumatic and challenging situations a child can face. But with the love of family and the help of friends - you can begin to chase those clouds away.
That's a page from my notebook.
I'm Katie Couric, CBS News.