Toopy and Binoo is a Canadian TV series that ran for two years from January 2005 to December 2006 and now frequents children's TV with reruns.
It is about two inseparable friends who live in an imaginary world and have adventures. They are always happy, humourous and quite unusual. The series has resonated with all of my children, most recently my baby daughter.
The boys are currently watching tennis and the baby keeps looking at them beseechingly and saying "Toopy and Binoo". At some point soon they will relent.