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A and D are married to each other. A is the mother of L. L is the husband of P. P is the mother of U. U is the sister of O. O is the only grandson of D. How is O related to L?
Father's father
Son
Daughter
Father
Son
Identify O's generation relative to D. Since D is a grandparent and O is a grandson, L is the child of D (A+D are parents). P is the daughter-in-law of A/D. Since P is mother of O, O is the son of L and P.
Identify O's generation relative to D. Since D is a grandparent and O is a grandson, L is the child of D (A+D are parents). P is the daughter-in-law of A/D. Since P is mother of O, O is the son of L and P.
Establish Generation 1 & 2
A and D are married (Gen1). A is the mother of L, so D is the father of L (Gen2).
Establish Generation 3
L is the husband of P, and P is the mother of U and O. Since L is the father of U and O, O is the child of L and P.
Conclusion
As O is the grandson of D (Gen 3 relative to Gen 1), and O is the child of L, O is the son of L.
A: Father's father is incorrect because O is the grandson of D, not the ancestor. C: Daughter is incorrect because the question identifies O as a 'grandson' (male). D: Father is incorrect because L is the father of O, not the other way around.
B is correct because L is the father of O, making O the son of L.
In blood relation questions, always draw the tree with gender symbols (+ for male, - for female) and marriage indicators (=) to avoid confusion during long chains.