A is the son of B. B's sister has a son D and a daughter E. F is the maternal uncle of D. In this family relation question, how is E related to F?

Introduction / Context:
This blood relation puzzle introduces several members: A, B, B's sister, her children D and E, and a man F who is described as a maternal uncle. The question asks how E is related to F. Solving this requires understanding terms like maternal uncle and carefully tracking who is whose mother and sibling.

Given Data / Assumptions:
• A is the son of B.• B has a sister; this sister has two children: D (a son) and E (a daughter).• F is the maternal uncle of D.• Maternal uncle means brother of the child's mother.• E is the daughter of the same mother who is the mother of D.

Concept / Approach:
Since F is the maternal uncle of D, F must be the brother of D's mother. D's mother is B's sister, because D is her son. Therefore, F is the brother of B's sister. That means F is also the maternal uncle of any other children born to the same mother, including E. So E is a niece of F, just as D is his nephew. The challenge is simply to spot that D and E share the same mother and that a maternal uncle stands in the same relation to all her children.

Step-by-Step Solution:
Step 1: B's sister has a son D and a daughter E. So D and E are siblings, and their mother is B's sister.Step 2: F is given as the maternal uncle of D. This means F is the brother of D's mother.Step 3: The mother of D is the same person as the mother of E, because they are siblings.Step 4: Therefore, F is also the brother of E's mother.Step 5: The brother of a person's mother is that person's maternal uncle.Step 6: So F is the maternal uncle of E as well.Step 7: From E's perspective, a maternal uncle is an uncle, making her his niece.

Verification / Alternative check:
Draw a diagram: Put B and B's sister in one generation. B's sister has two children, D and E. Then add F as the brother of B's sister. Relative to D, F is a maternal uncle. Relative to E, the relationship is identical, because she shares the same mother. Thus E must be the niece of F, while D is his nephew. There is no way to interpret the information that makes E a daughter, sister or wife of F without contradicting the given structure.

Why Other Options Are Wrong:
Sister: E is not a sibling of F; they are from different generations.Daughter: A daughter would be a direct child of F, which is not stated.Wife: This would imply a spousal relationship, which contradicts the uncle niece structure.Cousin: Cousins share grandparents; here F is in the parental generation of D and E, so he is an uncle rather than a cousin.

Common Pitfalls:
Sometimes candidates mistakenly assume that being maternal uncle of D only tells us about F and D, and forget that the same mother also has E. As soon as you remember that D and E have the same mother, it becomes obvious that anyone who is maternal uncle of D is also maternal uncle of E. Therefore, E must be F's niece, which is the intended answer.

Final Answer:
E is the niece of F.