The Question and Answer section for Wuthering Heights is a great resource to ask questions, find answers, and discuss the novel.
I would consider Linton Heathcliff.
Lockwood is referring to the isolation imposed upon Heathcliff's daughter-in-law. Being buried alive in the country could be the only explanation for her choice of husband.
I'm sorry, this is a short-answer literature forum. We are unable to answer questions relating to other academic subject matter.