I'm My Own Grandpa

"I'm My Own Grandpa" (sometimes rendered as "I'm My Own Grandpaw") is a novelty song written by Dwight Latham and Moe Jaffe, performed by Lonzo and Oscar in 1947, about a man who, through an unlikely (but legal) combination of marriages, becomes stepfather to his own stepmother.

[6] The cover version by Lonzo and Oscar was recorded in 1947, the same year that Latham and Jaffe released The Jesters original.

This song was also performed by Grandpa Jones, who sang it both at the Grand Ole Opry and on the TV show Hee Haw.

The humorous folk singer, Anthony John Clarke, frequently covers it in his gigs and has recorded it on his 2004 album Just Bring Yourself.

German country band Truck Stop from Hamburg published a German-language version in 1982 called „Mein Opa, das bin ich.“ In 1984, Norwegian folk singer Øystein Sunde published a Norwegian-language version, «Jeg er min egen bestefar».

Professor Philip Johnson-Laird used the song to illustrate issues in formal logic as contrasted with psychology of reasoning, noting that the transitive property of identity relationships expressed in natural language was highly sensitive to variations in grammar, while reasoning by models, such as the one constructed in the song, avoided this sensitivity.

[8] The situation is included in a set of problems attributed to Alcuin of York, and also in the final story in Baital Pachisi; the question asks to describe the relationship of the children to each other.