Thank You Acknowledments

Sometimes I feel like I need to be the family police!  Why is it that the youth of today cannot see the need to send a simple Thank You for a gift they receive?  I hear from my parents all the time about Thank Yous they have not received.  I am not always the parent of the errant child or grandchild yet it seems I am the only one who should have the answer.  I try to remind my own children and grandchildren to call or send a Thank You but that doesn't always work.  So reminding all 13+ great grandchildren is almost impossible.  

I think maybe I hear the complaint because I spend the most time with my parents because I live closest to them.  I just wish I knew what to do to teach these young people some respect.