If A is the only daughter of F, A is married to B, and P is the daughter of A,…

In blood-relation problems, build a family tree from the given links (parent-child links such as 'daughter of', and spouse links such as 'married to'). By the standard convention of these puzzles, a person's spouse is read as the joint parent of that person's children unless the stem explicitly states otherwise (e.g., step-parent or adopted). Assign gender from the relation words used, and then read the asked relationship by moving along the tree edges.

1. F has a daughter A, so A is F's child and a female member of the family.

2. A is married to B — this is the spousal link, so B joins the family as A's partner, at the same generation level as A.

3. P is the daughter of A, so A is P's mother, one generation above P.

4. Since B is A's spouse and A is P's mother, B sits at the same generation as A relative to P — that is, B is P's father.

Cross-check by drawing the tree: F leads to A (as daughter); A and B (married) lead to P (as daughter). Tracing from B to P through the marriage-then-parent edges confirms B is P's father, matching the family diagram.