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A Family Party

Unreviewed import — a classic from the public domain; its solution has not been machine-checked yet.

math
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?

Solution

Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.

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