How is Jethu related to Jesh? Kamlesh is brother of Jesh. Kamlesh is Jethu's…

Concept

In a “how is X related to Y” data-sufficiency question, a statement is sufficient on its own only if it lets you trace an unbroken family link connecting BOTH people named in the question. A statement naming only one of them, or a fact about a third person, cannot decide the relation by itself. Two standard kinship rules do the chaining here: siblings share the same parents, and “A is B's son/daughter” fixes a parent-child link between A and B.

Application

1. Statement 2 alone: “Kamlesh is Jethu's son” fixes only Jethu's relation to Kamlesh (parent-child); it never mentions Jesh, so Statement 2 alone cannot answer the question.

2. Statement 1 alone: “Kamlesh is brother of Jesh” fixes only that Kamlesh and Jesh are siblings; it never mentions Jethu, so Statement 1 alone cannot answer the question either.

3. Combine both: from Statement 2, Jethu is a parent of Kamlesh (and, since Kamlesh is referred to as a son, Jethu is identified as the father). From Statement 1, Jesh shares the same parents as Kamlesh through the sibling relation. Chaining the two facts through Kamlesh shows Jethu is also the father of Jesh.

Cross-check

Neither statement, read alone, ever mentions both Jethu and Jesh together — confirming each is individually insufficient. Only the combination traces one unambiguous link between them, with no alternative reading possible, confirming that both statements together (and only together) are sufficient to answer the question.