HE HILTON FAMILY ARE TAKING A TRAIN RIDE ON THE TRAIN THERE IS A GRANDMOTHER A GRANDFAT RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

There are only 3 people
There's a grandmother her daughter and granddaughter. Did you answer this riddle correctly?
YES  NO  

The couple is either a man and his daughter or an uncle and his niece. Did you answer this riddle correctly?
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A toy airplane. Did you answer this riddle correctly?
YES  NO  

Japan Did you answer this riddle correctly?
YES  NO  

A militia. Did you answer this riddle correctly?
YES  NO  

Tom Did you answer this riddle correctly?
YES  NO  

Pregnancy Did you answer this riddle correctly?
YES  NO  

7. Each girl has the same brother. Did you answer this riddle correctly?
YES  NO  

Aunt-Arctica! Did you answer this riddle correctly?
YES  NO  

Toothless the Dragon Did you answer this riddle correctly?
YES  NO  

Ron: Auror, 19
Hermione: Ministry, 20
Harry: Teacher, 21 Did you answer this riddle correctly?
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The sun because it was the morning. Did you answer this riddle correctly?
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A latke hugs and kisses! Did you answer this riddle correctly?
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Your mother Did you answer this riddle correctly?
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1/3

This is a famous question in understanding conditional probability, which simply means that given some information you might be able to get a better estimate.

The following are possible combinations of two children that form a sample space in any earthly family:

Boy - Girl
Girl - Boy
Boy - Boy
Girl - Girl

Since we know one of the children is a boy, we will drop the girl-girl possibility from the sample space.
This leaves only three possibilities, one of which is two boys. Hence the probability is 1/3 Did you answer this riddle correctly?
YES  NO