How does steinbeck present him slowly becoming involved?

If you are asking about how Candy becomes more involved with Lennie and George, we can say that he becomes more involved as they include him as a part of their dream of the future when they might have their own ranch and somehow raise their own animals. In a way they hope to be partners in a dream that they want to fulfill, a way in which, with their various disabilities and problems, they can still be happy.