HOW A MAN BECAME HIS OWN GRANDFATHER
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I married  a widow who  had a daughter,  my father visited  our home
frequently,  fell in  love  and married  my  step-daughter, thus  my
father became my son-in-law, and my step-daughter my mother, for she
was my father's wife.

  My step-daughter  had also a son,  he was of course  my grandchild
and my brother at the same time because he was the son of my father.
My wife was my grandmother, for she was my mother's mother.

  I was my wife's husband and grandchild at the same time and as the
husband of a person's grandmother is his grandfather.

...I was my own GRAND FATHER.

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