 The kids have been saving trading stamps, but then learn that the local vendor plans to go out of business. The boys have 54 books, while the girls have 40, and decide to pool their books to get one really nice gift. The problem is each set of siblings wants to pick the gift for a gender-specific item (the boys want a rowboat, while the girls want a sewing machine). When Mike and Carol are unable to reason with the children, they decide to settle the matter by having them build a house of cards.