Now, many many years ago 
When I was twenty three 
I was married to a widow 
Who was pretty as could be 

This widow had a grown-up daughter 
Had hair of red 
My father fell in love with her 
And soon the two were wed 

This made my 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 matters 
Even though it brought me joy 
I soon became the father 
Of a bouncing baby boy 

My little baby then became 
A brother-in-law to dad 
And so became my uncle 
Though it made me very sad 

For if he was my uncle 
That also made him the brother 
Of the widow's grown-up daughter 
Who, of course, was my step-mother 

I'm my own grandpa 
I'm my own grandpa 
It sounds funny I know 
But it really is so 
I'm my own grandpa 

My father's wife then had a son 
That kept them on the run 
And he became my grandchild 
For he was my daughter's son 

My wife is now my mother's mother 
And it makes me blue 
Because, she is my wife 
She's my grandmother too 

I'm my own grandpa 
I'm my own grandpa 
It sounds funny I know 
But it really is so 
I'm my own grandpa 

Now, if my wife is my grandmother 
Then, I am her grandchild 
And every time I think of it 
It nearly drives me wild 

For now I have become 
The strangest case you ever saw 
As the husband of my grandmother 
I am my own grandpa 

I'm my own grandpa 
I'm my own grandpa 
It sounds funny I know 
But it really is so 
I'm my own grandpa 

I'm my own grandpa 
I'm my own grandpa 
It sounds funny I know 
But it really is so 
I'm my own grandpa