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Data sufficiency (siblings and lineage): How is B related to C? Given: D is the brother of B. Which statements are necessary? (1) The son of D is the grandson of C. (2) B is the sister of D. Choose the correct necessity condition.

Difficulty: Easy

Only 1
Only 2
Either 1 or 2
1 and 2 both are required

Correct Answer: 1 and 2 both are required

Explanation:

Use (1)
D's son is C's grandson ⇒ D is a child of C.

Combine with (2)
B is the sister of D, so B is also a child of C ⇒ B is C's daughter.

Necessity

(1) alone: identifies D as C's child, but B's gender is unknown ⇒ cannot say “daughter”.
(2) alone: does not connect B/D to C at all.

Conclusion
Both (1) and (2) are required.

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