A, B, C, D, E, F and G are members of a family with four adults and three children. F and G are girls. A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. B is married to D and G is their child. In this situation, who is C?

Introduction / Context:
This is a typical family arrangement puzzle mixing professions, genders and relations. We are told about seven family members, their occupations, marriages and children. The final question asks us to identify who C is. Solving this requires systematically assigning adults and children and then fitting each clue so that all conditions, including the counts of adults and children, are satisfied.

Given Data / Assumptions:
• Family members are A, B, C, D, E, F and G.• There are four adults and three children.• F and G are girls.• A and D are brothers and A is a doctor.• E is an engineer, married to one of the brothers, and has two children.• B is married to D and G is their child.• We assume that adults are the two married couples and one additional adult if needed, and that children are exactly three members.

Concept / Approach:
We first identify the four adults and three children. Since E is married to one of the brothers and has two children, and B is married to D with G as their child, we can deduce that A and D are the two brothers, E and B are their spouses, and F, G and C must be the three children. Then we decide which children belong to which couple. The puzzle states that E has two children, and G is specified as the child of B and D. Thus E and A must have the remaining two children F and C. That makes C the son or daughter of A. Since F and G are already given as girls, C is naturally treated as A's son to maintain a typical distribution and to match the option that asks who C is.

Step-by-Step Solution:
Step 1: Adults must be A, B, D and E, because A and D are brothers, E is an engineer and B is married to D.Step 2: Children must then be C, F and G, the remaining three members.Step 3: It is given that E is married to one of the brothers and has two children. Since B is married to D, E must be married to A.Step 4: B and D have one child, G. Therefore the remaining two children must belong to A and E.Step 5: F is explicitly mentioned as a girl and G is also a girl, so C is the remaining child of A and E and is naturally taken as their son.Step 6: Hence C is best described as the son of A.

Verification / Alternative Check:
Create a table: adults A (doctor), D (brother), B (spouse of D), E (engineer spouse of A); children C, F, G. E must have two children, so A and E have C and F. B and D have G. This satisfies four adults and three children. F and G are already given as girls; C is the remaining child and is commonly taken as male to fit the role son of A in the given options. All clues now align perfectly.

Why Other Options Are Wrong:
Daughter of E: Although C is a child of A and E, F is more naturally identified as a daughter, and the option that fits C more precisely is son of A.Father of F: F is a child, and the father must be A, not C.Brother of G: C and G belong to different couples, and nothing in the statements forces C to be G's brother.Unrelated outsider: All seven letters represent family members, so C cannot be an outsider.

Common Pitfalls:
A common error is to miscount adults and children or to assume that F, G and C all belong to the same parents. Candidates may also forget that E has exactly two children and B and D already have G, forcing the remaining two children to be with A and E. Once this is recognized, identifying C as A's son becomes straightforward.

Final Answer:
C is the son of A.