Explanation:

- The family consists of three married couples.

- G is L's maternal grandfather; thus, G is related to L through L's mother (F).

- L is the only son of F. Therefore, F is likely the daughter of G.

- J is M's paternal uncle, suggesting that J is the brother of M's father, K.

- M is K's only daughter, so K is married to J's brother.

- H is J's sister and the daughter of I. J is H's brother and also E’s brother.

- J is the maternal uncle of L, which means F is J’s sister, making E their sibling too since E and H are siblings in some combination.

- K is G's daughter-in-law, indicating G’s son is J, H, or E.

Given these clues, the most appropriate relation is that E is the brother of H.

Correct Answer: Option 4, Brother