Concentrate for this one....
The Tasmanian 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 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 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 it makes me blue.
Because, although she is 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.
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This is one for the computer-minded people out there:
http://sct.staghosting.com/index.html
http://www.rinkworks.com/stupid/