Who is Matthew and how is he connected to the people who gather at Miss Havisham's?

Miss Havisham's cousin, but not one of her relatives that is greedy. Matthew Pocket has charge of nine children, two nurses, and a pretty but useless wife. He also tutors young gentlemen, including Pip.

Matthew is a relative of Miss Havisham's, and so gathers at her house with the others. He proves less greedy than the others ultimately do, and later will serve as tutor to Pip. I think he is a cousin.

Matthew Pocket is a relative of Miss Havisham. He is her cousin. He comes to see Miss Havisham, as do many of her relatives, in the hope that he may somehow receive some of her money. He is the father of Herbert Pocket who later becomes Pip's tutor and best friend once Pip moves to London.

Matthew is Miss. Havisham's cousin. When everyone gathers at Miss. haversham's they denounce Matthew, and Havisham describes how he's been told he'll never be welcome in her home again. Matthew had opposed her marriage, but she still misses him, and at the end of the chapter she announces that when she dies and when her body is laid on the dining room table, Matthew will be at the head of the table. I guess that time has healed her anger!

Clearly, we all love Matthew Pocket dearly and wanted him fairly represented in the answer to your question :)