At least 3 people, but more people make for more fun
Line players up, close enough so that they can whisper into a neighbor's ear, but not so close that other players can hear them. The first person in the line makes up a phrase, sentence, or a very brief story (adjust complexity for the age of your grandchildren) and whispers it to the next person in line. That person whispers it to the next person and so on. The last person to receive the story says it aloud. The first person then reveals the original message.
This game doesn't have winners and losers. Laughter is the goal. The last story invariably differs from the original in very silly ways. As a bonus, grandchildren also learn a lesson about how unreliable word of mouth can be.
make it more fun
Increase the difficulty by turning up the volume on a television or stereo. Have the first person draw a picture, which the second person must describe, and then pass on to the next person. The last person to hear the description draws what is described. Compare the two pictures for a laugh.
How well do you get along with your grandchild and other family members? Want to know if your personalities mesh?Find out here.