Question

pointing to a lady in photograph , Manish said " she is the daughter of my grand father's only son .How is Man I sh related to that lady ?

Answer 1

Heyy !
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grandfather's only son => Father : daughter of father => sister 
That's is manish is that lady's brother 
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Answer 2

Hi frnd she is Manish's sister.Because his grand father's only son is his father and his father's daughter is his sister.