What is Pip's and Mr. Pocket's relationship?

Pip has come to London to learn to be a gentleman, and Mr. Pocket has been selected by Mr. Jaggers to teach him in whatever social skills he is currently missing. In this tutoring, Pip becomes more acquainted with the Pocket family, including the irresponsible Mrs. Pocket. Their son, Herbert, is Pip’s roommate and also his partner in living a lifestyle beyond their income. Herbert, on Pip’s first day in London, teaches Pip the proper way to eat, as opposed to Pip’s “country” manners. Their friendship blossoms and they become constant companions. In company with Herbert, Pip frequently visits the home of Mr. Pocket, which is one of chaos and commotion. Mr. Pocket is visibly frustrated with his wife, who is completely out of touch with any reality other than the supposed nobility of her deceased father. Nevertheless, it is through the relationship of Pip and Mr. Pocket that Pip learns the little skills necessary to at least look and act like a gentleman.