It's many, many years ago when I was twenty three
I was married to a widow who was pretty as can be
This widow had a grown-up daughter whose hair was red
My father fell in love with her and soon these two were wed
This made dad my son-in-law and changed my very life
My daughter was my mother 'cause she was my father's wife
To complicate the situation though it brought me joy
I soon became the father of a bouncing baby boy
This little baby then became a brother-in-law to dad
That made him my uncle though it made me kinda sad
'Cause if he was my uncle then he also was a brother
To the widow's grown-up daughter who of course was my step-mother
My father's wife then had a son who kept him on the run
He became my grandchild because he was my daughter's son
My wife is now my mother's mother and that makes me blue
Because although she is my wife, she's my grandmother too
And if my wife is my grandmother then I'm her grandchild
And every time I think of that it nearly drives me wild
Now I have become the strangest case you ever saw
As husband to my grandmother I am my own grandpa
Well, I'm my own grandpa I'm my own grandpa
That may sound funny I know but it really is so I'm my own grandpa