Mine don't really ask why they never see them because we go to the same church, so they do see them every Sunday even though it's just after the service for about 10 minutes. But one thing I've found my children like to do is call them. Even if it's me talking to my mom for something I'll say would you like to talk to Olivia for a minute. It seems to make both ends happy. My six year old son likes to color pictures and then send them in the mail to them. Just a few ideas!