Question
Archit is brother of Priyanka who is married to Manish.
Manish is father of Arijit who is father in law of Rakesh and has two children, then how Archit is related to Arijit?Solution
Male (+) Female (-) Spouse (x) Brother/Sister (=) Archit is brother of Priyanka who is married to Manish.                                                Archit(+)             =            Priyanka (-)        x             Manish (+) Manish is father of Arijit who is father in law of Rakesh and has two children. 
We don't know the names of two children of Arijit so we have assume X and Y.
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