My 16-yr-old stepson wonders whether anybody has ever charted this out to see if it all works logically. I said it's all mixed in with stepmothers and stepfathers and step-this and step-that. As far as I can see, all the singer might be able to claim is that he is his own stepgrandpa - but it's best to just enjou the song and not worry about that.
In my experience, 16-yr-old boys are literalists, so they are unable to make the logical jumps needed to enjoy a song like Grandpa. If things aren't exactly right, then they have no value at all to a 16-yr-old boy. They have no room at all for imagination, unless the object of imagination is female. Some 16-yr-old boys never grow up - we call them "fundamentalists."
But back to Grandpa, has anybody got this all figured out?
-Joe Offer-