In the ‘30s, Latham had a group, the Jesters, on network radio; their specialties were bits of spoken humor and novelty songs. While reading a book of Mark Twain anecdotes, he once found a paragraph in which Twain proved it would be possible for a man to become his own grandfather. In 1947, Latham and Jaffe expanded the idea into a song, which became a hit for Lonzo and Oscar. It’s also one of the songs on Michael Cooney's album of Songs for Children http://www.ziplo.com/grandpa.htm