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Let's go to the cinema

Let's go to the cinema

Pedro, Paco and Pablo are three married men and none have more than one sister. They are waiting for Pablo's father-in-law and Pedro's father to go to the movies. Pedro and Paco are Pablo's brothers-in-law.

One of the three is an only child. Which one is it?

Solution

Pedro is an only child and is married to Pablo's sister. Pablo's father-in-law is Paco's father, since Pablo is married to Paco's sister.