We stop giving to the grandkids at 18 or when they finish high school, whichever comes first. I do have one son whose kids never write a thank you note, text, fb, e-mail or anything. I told them at Thanksgiving, that I wanted the GD to acknowlege her gift in some way. We'll see if it happens. She's 14, plenty old enough to do that. But she's a very demanding child with them and they let her get by with that too.I wish I had thought about including thankyou notes in her Christmas gift this year. But her birthday is in March, so maybe then.