H. E. Dudeney, Amusements in Mathematics (1917) No. 54 · Puzzles · Age & time puzzles
A Family Party
A certain family party consisted of 1 grandfather, 1 grandmother, 2 fathers, 2 mothers, 4 children, 3 grandchildren, 1 brother, 2 sisters, 2 sons, 2 daughters, 1 father-in-law, 1 mother-in-law, and 1 daughter-in-law. Twenty-three people, you will say. No; there were only seven persons present. Can you show how this might be?
H. E. Dudeney, Amusements in Mathematics (1917) · No. 54
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