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Born on the Same Day (illustration)
FILE No.165Unsolved

Born on the Same Day

Difficulty ★☆☆about 5 minEveryday MysteryNumbersWording
Born to the same mother on the same day, but not twins. What are they?

Case Record

Two people were born to the same mother on the same day. But these two are not twins.

Your question

What are they?

Case Files

Diagram

ConditionsItemDetailMotherSameBirth dateSameTwins?NoWhat are they?
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Can any number of people be born to the same mother on the same day?

Open hint 2

"Not twins" means they are two out of how many?

Open hint 3

Are siblings born one year apart born on the same day?

Solve It

Your question

What are they?

Choose the answer closest to the truth.

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The Truth

Triplets (two of three or more siblings)

The answer is "Triplets (two of three or more siblings)."

If they were born to the same mother on the same day and are "not twins," they are two of a multiple birth of three or more (such as triplets).

Siblings born one year apart have different birth years, and half-siblings with different fathers and cousins do not share the same mother.

Testing each choiceCandidateVerdictBorn a year apartDifferent years ✗Half-siblingsSame mother, but same day is implausible ✗Two of tripletsSame mother, same day, not twins ✓CousinsDifferent mothers ✗
Diagram of the solution

Key Points

  • Do not be caught up in the number "two"
  • Consider siblings of three or more
  • Rule out choices using the conditions

Why people get fooled

Because you decide that "born on the same day means twins."

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