How are the characters connected to one another in the book 'Of Mice and Men'?

Lennie and George are connected by their early lives, and their relationships with Aunt Clara. They have a kind of family tie.... and George is bound by a promise to care for Lennie just before Aunt Clara's death.

George and Slim establish a friendship based upon honesty and trust.

Candy shares George and Lennie's dream of a home, a future, and a place where he will not be alone.