Puzzle of the Day

[kcjenkins]

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?

[Kea]

There are 8 members of the family.

1st generation: husband and wife

2nd generation: they have one son who has one wife

3rd generation: they have 3 children -- 2 daughters and one son. The son has a wife.

[kcjenkins]

Wrong. The correct answer is 7:

The party consisted of 2 little girls and a boy, their father and mother, and their father's father and mother. I'm not sure why you added the son's wife? The mother of the children is a daughter in law to the grandparents.

[Kea]

Yep, you are right. I started working backwards with the daughter-in-law and didn't catch that I added a 2nd daughter-in-law.

I must now hang my head in shame since I am usually pretty good at these kinds of things.

[kcjenkins]

Don't hang your head, it was just for fun, and you did well anyway. I've seen answers much further off than yours way.