Every time a person dies they are taken to a cold, black room below the hospital. There is a waiting period of exactly 24 hours during which relatives and close friends are notified of the death so that they can lament. Sometimes people are so sad they want dead people back. If they are sad enough, the person in the black room will be revived.
When grandfather died, we adults just could not care, but we told you about it on the off-chance that your tiny heart would bear enough sorrow to wake him from the dead. It did not.