"I Am My Own Grandpa" by Ray Stevens

Many, many years ago

When I was twenty three

I got married to a widow

Pretty as could be.

This widow had a grown up daughter

With flowing 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.

Now my daughter was my mother,

For she was my father's wife.

To complicate the matters worse

Although 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,

Then that also made him brother

To the widow's grown up daughter,

Who of course was my step-mother.

Father's wife then had a son

Who kept them on the run,

And he became my grandson

For he was my daughter's son.

My wife is now my mother's mother

And it makes me blue.

Because although she is my wife,

She's now my grandma too.

If my wife is my grandmother,

Then I am her grandchild.

And every time I think of it

It simply 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!