Question
F is the mother of E and R is granddaughter of G, who is
husband of F. I is father of U and only son-in-law of F and his wife has no siblings. How is E related to U?Solution
Male (+) Female (-) Spouse (x) Brother/Sister (=) F is the mother of E and R is granddaughter of G, who is husband of F. It means F and G are spouse. I is father of U and only son-in-law of F and his wife has no siblings. We came to know that I is the husband of E and is the father of R and U. 
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