In a certain code language,
A @ B means ‘A is the son of B’,
A # B means ‘A is the sister of B’,
A + B means ‘A is the wife of B’ and
A % B means ‘A is the father of B’.

Based on the above, how is E related to B if ‘E + R @ D% N # B’?1

The correct answer is Brother's wife.

To determine how E is related to B in the expression ‘E + R @ D % N # B’, let us break down the given relations step-by-step from left to right:

1. E + R:
According to the given code, ‘A + B’ means ‘A is the wife of B’.
Therefore, E is the wife of R. (This means E is female, R is male, and they are a married couple).

2. R @ D:
According to the given code, ‘A @ B’ means ‘A is the son of B’.
Therefore, R is the son of D.

3. D % N:
According to the given code, ‘A % B’ means ‘A is the father of B’.
Therefore, D is the father of N. Since R is also the son of D, R and N are siblings (children of D).

4. N # B:
According to the given code, ‘A # B’ means ‘A is the sister of B’.
Therefore, N is the sister of B. This implies R, N, and B are all siblings (children of D).

Conclusion:
Since R, N, and B are siblings, R is the brother of B.
Since E is the wife of R, E is the wife of B's brother.
Thus, E is the Brother's wife of B.