Because B is A's Daughter.
Mr. A meets Mr. B. B is the father of a son C and a daughter D. E is the mother of A.C is married and has one son. E is the daughter-in-law of B. How is A related to B?
Andy is father of B and Dexter is son of C. Eric is brother of A and E also has a daughter Fanny, if Cindy is sister of A then what is the relation between the Fanny, B and Dexter ?