My Confusing Family Tree

Many many years ago,
When I was twenty-three,
I got married to a widow,
Who was pretty as could be.

This widow had a grown-up daughter,
With lovely 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,
For she was my father's wife.

To mess up things even 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,
Which made me very sad.

For if he was my uncle,
That also made him brother,
To the widow's grown-up daughter,
Who is my dear stepmother.

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 this just makes me blue.
Although she is still my wife,
She is 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!