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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.
A total of 23 people, you might think, but, no. What is the minimum number of people here?
[Ref: ZRZR]
7.
The party consisted of 2 little girls and a boy, their father and mother, and their father's father and mother.
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