Shared misery and loneliness. Possibly even to have some kind of control of something in his poverty stricken life. It is one of the themes of the whole book.
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Lennie's Aunt told George right before she died to take care of Lennie. It was obligation for George.
The boss suspects that George is trying to take advantage of Lennie by speaking for him and making decisions for him, rather than letting Lennie speak for himself. This leads the boss to question George's motives and the nature of their relationship.
The boss suspects that George is taking advantage of Lennie by making decisions for him and speaking on his behalf. He questions the nature of their relationship and whether George is exploiting Lennie in some way.
The boss was suspicious because he thought George was trying to cover up for Lennie's lack of intelligence or understanding. He may have also questioned George's control over Lennie and their relationship dynamic.
The boss assumes that George is taking care of Lennie because Lennie is not capable of taking care of himself due to his mental disability. He may also assume that George is taking advantage of Lennie in some way by having him work with him.
The boss is suspicious of Lennie and George because migrating workers never travel together. And because during the whole dialogue George never allows Lennie to answer questions directed towards him.
The boss in "Of Mice and Men" is generally impatient and frustrated by Lennie's mental slowness. He sees Lennie as a hindrance to George and suspects that Lennie might be taking advantage of George. The boss ultimately questions the legitimacy of George and Lennie's relationship.
so they get the job
He says that Lennie was kicked in the head by a horse and that he was George's cousin.
The boss suspects George of taking advantage of Lennie for his work and possibly withholding his wages. This suspicion arises from seeing Lennie's reliance on George for direction and protection, leading to the assumption that George may be exploiting Lennie's labor for personal gain.
The boss is like a little stocky man. He is suspicious of the bond between George and Lennie, and also question this friendship. However, George and Lennie do not argue with the boss in case of loosing their job.
George explained to the boss that he takes care of Lennie because they are like family and that Lennie doesn't understand certain things due to his mental disability. He reassured the boss that they are both hard workers and are capable of fulfilling their duties.
In "Of Mice and Men," the boss comes to view George as suspicious due to his relationship with Lennie. George handles Lennie's paycheck and he believes he may be exploiting him for personal gain. Furthermore, he doesn't allow Lennie to speak for himself.