In the country of "Numberland," only natural numbers live. Men and boys are even numbers, women and girls are odd numbers. After marriage, couples immediately have children, and these are all the numbers that divide their product without a remainder. The sum of the values of all the children of the Kvádřík family is 28. Mr. Kvádřík has a lower value than at least one of his sons. Determine the values of Mr. and Mrs. Kvádřík.

(M. Dillingerová)
The product of the parents is definitely less than 28. From the condition regarding the son, it is clear that the mother is not the number 1. At the same time, her value must be less than 14. If the mother is 3, then the products 6, 12, and 18 are possible. Of these, the product 12 satisfies the condition. If the mother is 5, 7, 9, 11, or 13, there is no solution.

Mr. Kvádřík is 4 and Mrs. Kvádříková is 3.

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