Four people are sitting around a campfire after a long day of recreation, when one man comments: "Do you realize that around this campfire, the four of us include a mother, father, brother, sister, son, daughter, niece, nephew, aunt, uncle and a couple of cousins"?.
If everyone is related by blood (with no unusual marriages) how is this possible?

A man and a woman who are brother and sister are there. The man's son and the woman's daughter are also there.

Posted by Math Man on 2018-11-15 09:01:15