Grandpa decided that shopping for Christmas presents had become too difficult. All his grandchildren had everything they needed, so he decided to send them each a check.
On each card he wrote, "Happy Christmas, Grandpa"
P.S. Buy your own present.
While Grandpa enjoyed the family festivities, he thought that his grandchildren were just slightly distant. It preyed on his mind into the New Year. Then one day he was sorting out his study and under a pile of magazines, he found a little pile of checks for his grandchildren. He forgot to put them in with the Christmas cards.