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At a birthday party in Victorian England there were the following people, each relationship being with regards to someone else at the party:
two grandparents, two fathers, two mothers, two sons, two daughters, two brothers, two sisters, two cousins, an uncle, an aunt, a nephew, a niece, a husband, a wife, a father-in-law, a mother-in-law, a son-in-law and a daughter-in-law.
What's the smallest number of people that could have made up that party?
(And justify your answer if you want to win!)
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