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 who 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, 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.

Who is my grandma?