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?
Solutions: 1
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