After the Holidays

Misty and Milda were talking about their grandchildren after the holidays.
 
Mitsy said, “My daughter-in-law stopped making my grandchildren send their `thank you’ notes. Each year I sent the grandchildren a card with a generous cheque inside. I always received a lovely `thank you’ note. However, since my daughter-in-law stopped making the grand kids send thank you notes, I never hear from them.”
 
Milda said, “My daughter-in-law never made the grandchildren send `thank you’ notes. I too send them a very generous cheque. However, for the past several years, I hear from them within a week after they receive it. In fact, they each pay me a personal visit.”
 
“Wow,” remarked Mitsy. “I wish mine would do that.”
 
“You can, Mitsy, you can.”

“How?”
 
Mitsy asked “Simple. Do what I do. Don’t sign the cheque!