We need to determine the relationship between D and A based on the given expression and coding rules.

Decoding the Relationship Expression

The expression is $A × B + C ÷ D$. Let's break it down using the provided codes:

• Code Rules:
  • $T × U$ means 'T is the mother of U'
  • $T + U$ means 'T is the sister of U'
  • $T ÷ U$ means 'T is the daughter of U'
  • $T - U$ means 'T is the wife of U'
• Step 1: Analyze $A × B$

  According to the rule $T × U$, 'A is the mother of B'. This implies A is female.

• Step 2: Analyze $B + C$

  According to the rule $T + U$, 'B is the sister of C'. This implies B is female.

• Step 3: Analyze $C ÷ D$

  According to the rule $T ÷ U$, 'C is the daughter of D'. This implies C is female.

Determining D's Relationship to A

Now, let's combine the information:

• From Step 1, A is the mother of B.
• From Step 2, B is the sister of C. Since B is the sister of C, and A is the mother of B, A must also be the mother of C.
• From Step 3, C is the daughter of D. Since we established A is the mother of C, D must be the other parent of C.
• Because A is female (mother), and D is the parent of C along with A, D must be the father.
• Therefore, D is the husband of A.

Final Relationship

The relationship of D to A is Husband.