How does George influence/affect three other characters in Of Mice and Men?

Though he is a small man, Georg Milton, who possesses the name of kings and a metaphysical poet, is intelligent and very discerning about people; therefore, he is able to influence others.

Here are three people upon whom George has an affect or some influence:

Lennie is virtually George's ward because he is mentally-challenged and is very childish in his thinking. George plays the role of a big-brother/parent who must constantly watch out for Lennie. Furthermore, he dominates Lennie as much as possible so that Lennie will not endanger others or threaten his and Lennie's own welfare.
In Chapter 1 as George and Lennie camp out, George scolds Lennie as though he is the bigger man's parent when Lennie has a mouse in his pocket; George then orders him to throw it away. When Lennie whines about not having ketchup for his beans, George scolds him, again. But, later, like a loving parent, George acquiesces to Lennie's request to recite their dream. This recitation soothes Lennie; afterwards, George then instructs Lennie to remember the place where they are in case he gets into trouble. If this happens, Lennie can just follow the river from the ranch where they are going to be working to the clearing and wait for George.

Once they are at the ranch, George gives Lennie strict instructions to let him do the talking, and to stay away from Curley, who is very pugnacious. Since Lennie was almost charged with rape in Weed where they worked previously, George tries to keep Lennie under control. Certainly, George tries very hard to keep Lennie away from females. So, frequently Lennie tells others, "George don't want me to ------" as he tries to follow George's orders.

When Lennie and George arrive at the ranch and they are in the bunkhouse, Candy is respectful to George as he answers the newcomer's questions. George also inspires enough ease in old Candy that the swamper feels comfortable enough to tell him in confidence about Curley. He adds,

"Don't tell Curley I said none of this. He'd slough me. He just don't give a damn. Won't ever get canned 'cause his old man's the boss."(Ch. 2)

Also, after Candy loses his dog and he hears George recite the dream to Lennie, he is revived from his depression by a hope that he can be a part of the farm that they are going to have; in fact, he offers his savings to the men. After George accepts and says that now owning a farm is a real possibility, Candy becomes much happier, and proudly boasts to Crooks that he and George and Lennie are going to own a ranch and have a future.

The mule skinner is a tall man with "God-like eyes" who is highly respected by both bosses and the ranch hands alike. Yet, he engages George in conversation and is interested in his history. When he first talks with George, Slim moves back out of the light in order to give George a "calm invitation to confidence." As they talk, Slim is "quiet and receptive" (Ch. 3), displaying a respect for George. Further, he asks George about "going around" with Lennie because most men are loners.
Of course, he later befriends George after Lennie's death, consoling him by saying, "You hadda, George. I swear you hadda. Come on with me" (Ch. 5).