§ 1. The Dinner Party

Problem. — The Governor of Kgovjni wants to give a very small dinner party, and invites his father’s brother-in-law, his brother’s father-in-law, his father-in-law’s brother, and his brother-in-law’s father. Find the number of guests.

Answer. — One.

          A=a
           |
      -----------
      |     |   |
    b=B   D=d   C=c
     |     |     |
     | ------ -----
     | |  | | |   |
     e=E  | g=G   |
          |       |
          F=======f

The original diagram was ambiguous, making either D or d the offspring of A. I have amended that. — Ed.

In this genealogy, males are denoted by capitals, and females by small letters.

The Governor is E and his guest is C.

The detailed explanation is as follows: His father’s brother-in-law is B or C. His brother’s father-in-law is C. His father-in-law’s brother is C. His brother-in-law’s father is C. Therefore the smallest possible

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