This is a great idea! I remember struggling during video chats with far-away relatives while my kids got bored. Exactly as you said in your proposal - there was a pressure to perform. I remember there was one session during a google hangout where the kids dressed up their Grandma with the Google "effects" (putting a tiara or hat on Grandma) and it went wonderfully. I can totally see your idea working out well - amusing the younger spectrum of children and fostering a good relationship with those far away!