This question is based on Charles Dicken's Great Expectations. 'I had little objection to his being seen by Herbert or his father for both of whom I had a r...

This question is based on Charles Dicken's Great Expectations.
'I had little objection to his being seen by Herbert or his father for both of whom I had a respect; but I had the sharpest sensitiveness as to his being seen by Drummle, whom I held in contempt. So throughout life our worst weakness and meannesses are usually committed for the sake of the people whom we most despise.
Who is the person whose expected visit is being discussed here?