george tells the boss lennie is his..?

a.brother
b.uncle
c.cousin
d.son

a. brother

The sentence is incomplete, and it's not clear what George is telling the boss about Lennie. However, based on the answer options provided, George could say that Lennie is his:

a. brother,
b. uncle,
c. cousin,
d. son.

Without more context, it is impossible to determine the correct answer.

To determine the answer, we need more context or information related to the question. The question seems to be incomplete or referring to a specific literary or fictional scenario. If you can provide more information or clarify the question, I will be able to assist you further.