His favorites are Guo-guo and Samantha at Little Dinosaur.  Guoguo's mom Mary is the daycare owner and a classical Chinese instrument musician.  We have Guoguo over sometimes after school and the two just talk in Chinese non-stop.  One night we tried sleep over, didn't succeed as Guo-guo finally wanted to go home when he realized it's really bed time.  The two kids really bond and so do the two moms :-)