That’s the thing. I do feel sympathy for Meg because the family is utterly appalling. All of them.
This is why Meg was such a risk to the RF. She came from nowhere and no one knew anything about her and her family background. She hid her family from Harry and created a narrative of who she was to fit in with him.
If Harry was going out with the usual posho, the RF would know all about them, their family, who they are friends with, what schools they went to, what scandals the family had. Its a small world they inhabit. Even though Kate wasn’t an aristo, she went to the right schools etc and was easily ‘verified’