Given the following relations:
- \( A + B \) means A is the sister of B,
- \( A - B \) means A is the brother of B,
- \( A \times B \) means A is the daughter of B.
We need to find the relation that shows 'E' is the maternal uncle of 'F'.
For 'E' to be the maternal uncle of 'F', the relation must imply that:
- D is the brother of F (since D is the male and the uncle),
- E is the sister of D (making E the maternal uncle).
Thus, the correct relation is \( D - F \times E \), where:
- \( D - F \) means D is the brother of F, and
- \( F \times E \) means F is the daughter of E.
Therefore, the correct answer is option (2).