YOUR MOTHER AND FATHER HAVE A CHILD IT IS NOT YOUR BROTHER AND IT IS NOT YOUR SISTER WHO IS IT RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Zero. If read to grammatical perfection, the riddle uses the word 'had' in a pas-tense format which means he no longer has children.

Therefore all of the daughters and brothers could be from a prior marriage, affair etc. Although, again, the riddle doesn't not specify that the brothers are 'step brothers.' Did you answer this riddle correctly?
YES  NO  

Mary has four daughters. Let x be the daughter.
Four daughters mean - x + x + x + x
Each of her daughters has one brother - let y be the son.
Total children => x + x + x + x + y. => 5
She has Total 5 children, all of her daughters have the same 1 brother. Did you answer this riddle correctly?
YES  NO  

Mary. Did you answer this riddle correctly?
YES  NO  

Mary Did you answer this riddle correctly?
YES  NO  

Simba Did you answer this riddle correctly?
YES  NO  

The two babies are two of a set of triplets. Did you answer this riddle correctly?
YES  NO  

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

He was born in August in a town called March, became a priest and married his widowed mother to her second husband in February. Did you answer this riddle correctly?
YES  NO  

They were the same man. Grover Cleveland served two terms as president of the United States, but the terms were not consecutive. Did you answer this riddle correctly?
YES  NO  

It was not raining. Did you answer this riddle correctly?
YES  NO  

Because her children weren't that bright! Did you answer this riddle correctly?
YES  NO  

Christmas Did you answer this riddle correctly?
YES  NO  

The dentist was the boy's mother. Did you answer this riddle correctly?
YES  NO  

Moses Did you answer this riddle correctly?
YES  NO  

One big pile. Did you answer this riddle correctly?
YES  NO