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  Reasoning

Puzzling Relations
 
Q A man named George was hurrying to get ready for a dinner party when Dan rang his doorbell.

"I'm just rushing off to a dinner party," said George, "but I'm sure it would be fine if you came along."

So the two went off together. When they arrived at the party, George, who always enjoyed getting people to use their heads, introduced Dan to the other guests with the following rhyme:

"Brothers and sisters have I none,
But this man's father is my father's son."

How were George and Dan related?


 
A Dan was George's son.