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There are seven people A, B, C, D, E, F, G living in a building which has seven floors from (1-7). Out of the seven people living six of them belong to a family and in the family, there are two couples. Each couple lives together and has a separate floor and rest of them have separate floors so two floors are empty. The following information is known about them. G is the son-in-law of D. Neither top floor nor first floor is empty. D lives on a floor immediately below that of E. There are two floors between the floors on which the two couples live. C is E’s nephew and lives two floors above the floor on which B lives. A’s sister lives on the 3rd floor.

Please answer it with steps or explanations. Thanks in advance

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Given G is son-in-law of D.. so with this statement we can infer that G is married and D is married and are part of two different couples.

Given C is E's nephew. So now we have following two options for the family tree.

### C                                            C

Option 1                               Option 2

Note: <--> notation is denoting a couple relation, / is denoting a parent- child relation

With option 1 of the family tree, we cannot derive a floor arrangement that satisfies the given conditions.

But option 2 of family tree we can derive a floor arrangement that satisfies the given conditions as below

 7 C 6 5 BG 4 3 E 2 DA 1 F

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Thanks Neha...
Then who is A's sister

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