# Someone’s mum has four sons. Monday, Tuesday, and Wednesday

Someone’s mum has four sons. Monday, Tuesday, and Wednesday. What’s the name of the fourth son?

This is too obvious. You just gave the name of the fourth son, and his name is Someone. Unless Someone is a girl and the mum has 4 sons and a daughter.

Then the daughter’s name is Someone, and the 4th son could be named Thursday or Sunday, assuming the parents are logical. But honestly, there isn’t much logic in having 4 sons and a daughter. That’s just a crazy house.

The way the question is written is interesting.

Statement 1: Someone’s mum has four sons.

Statement 2: Monday, Tuesday, Wednesday.

Question 1: What is the name of the fourth son?

Question 2: Can you guess the fourth son’s name?

Statement 3: I’m looking for a genius answer.

The first and second statements don’t necessarily go together. It does not explicitly state that the son’s names are M, T, W; but we are biased to assume they do. This bias would lead some to state the answer is “Thursday”.

The first question would lead us to believe that “What” is the name of the fourth son, as we’ve seen many puzzles with similar phrasing in the past and believe we are applying deductive reasoning to the problem.

The second question would then be answered “Yes” because we’ve either answered “Thursday” or “Someone”.

I think the honest answer to this is “I don’t know” for Q1 and either “No” or “It is possible, but the odds are extremely low” for Q2.

Not a genius answer, but an honest one.

EDIT: Perhaps we should reinterpret Statement 3 as: “I’m looking for a ‘Genius’ answer”. In which case, the answers to Q1 and Q2 would be “Genius” and “Yes”.

## Someone’s mum has four sons. Monday, Tuesday, and Wednesday. What’s the name of the fourth son?

Specifically, for this question, the appropriate answer would be “Someone”.

But the format in which I saw the question was like this, “Someone’s mum has four sons. North, East, and west. What is the name of the fourth son?

Can you guess the: name of the fourth son?” For this particular question, the answer would be “What”

Sure: the fourth son is either Tuesday, Monday, Someone or Wednesday.

Either has a 25% chance of being correct (assuming there’s sufficient information in the question for anything meaningful other than a ‘no’).

When talking about children it’s usual in English when attaching numbers to them to talk about the order of their birth. So the fourth son of four sons normally refers to the youngest.

But when just listing children there’s no such rule – fame, favoritism, starting with the ones the writer went to school with, an order of birth (parents often use this when listing their own children) or some other criterion applies.

There’s no information in the question about the order of their birth. There’s nothing to suggest that Monday was the first son – he might be the first, second, third or fourth son.

As others have answered: The four sons are likely called Tuesday, Monday, Someone and Wednesday.

So: the fourth son is either Tuesday, Monday, Someone or Wednesday.

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The standard riddle answer is “Someone”. But let’s read the riddle again. The days of the week might not necessarily be common names.

You see, Mum could be divorced, and she takes care of her four sons on the days Monday, Tuesday, and Wednesday.

“Mum” is from the UK – which narrows down the list of likely names.

She had little free time raising three boys (and possibly daughters too), and having no time to ponder names anymore, she probably would have named her fourth son something simpler than the first three. My guess is the popular name, Oliver.