Understanding the Relationship: Son of Brother

The question asks about the relationship term for the son of one's brother. In family relationship terminology, there are specific words used to describe different connections.

Identifying the Correct Term for Brother's Son

Let's look at the options provided and determine which one correctly describes the son of a brother:

• Nephew: A nephew is defined as the son of one's brother or sister, or of one's brother-in-law or sister-in-law.
• Cousin: A cousin is the child of one's uncle or aunt. An uncle is the brother of one's parent, and an aunt is the sister of one's parent.
• Sibling: A sibling is a brother or a sister. This term refers to children who share one or both parents.

Based on these definitions, the term that specifically refers to the son of one's brother is nephew.

Analyzing the Options

Let's analyze the given options:

• Option 1: nephew - This matches the definition of the son of a brother.
• Option 2: cousin - This is incorrect. A cousin is the child of an uncle or aunt.
• Option 3: sibling - This is incorrect. A sibling is a brother or sister.
• Option 4: More than one of the above - This is incorrect as only one term correctly applies.
• Option 5: None of the above - This is incorrect as there is a correct term among the options.

Therefore, the son of a brother is known as a nephew.