Step 1: Plan of attack: We will use the passage to see who the brother's kith and kin are. Then we match the group with an option.
Step 2: Test choice 1. Friends: the brother's friend was a separate person who made an offer, and the brother refused it. So kith and kin cannot be friends here. Reject.
Step 3: Test choice 2. Relatives: the earnings that would build the new house come from the brother's grandchildren and family. They are relatives. Accept.
Step 4: Test choice 3. Parents: the passage says the father lived to 103 and is no longer alive, and the brother's earnings came from younger family members. Reject.
Step 5: Test choice 4. Students: no student appears in the passage. Reject.
Step 6: Put the answer back and re-read: Read the question again in full: Choose the best option- Identify the meaning of the phrase 'kith and kin' Now place the choice "Relatives" into it. The sentence stays natural, it agrees with the passage, and it adds no new fact of its own. Each of the other three choices fails at least one of these checks, as the tests above showed. A choice that fails even one check cannot be the best answer.
Final Answer: Only relatives fits the group in the passage, so the answer is option 2. \[\boxed{2}\]
