only expects Elizabeth to know whether Wickham has any living relations, not about any of his other connections or recent history. And Darcy, brought up on the same estate, would certainly know as much about Wickham's family (though actually Wickham doesn't appear to have any living relatives) as Wickham knows about his.

The Gardiners are quite sure about Darcy's feelings and have been since Chapter 44. They were less sure of Elizabeth's, but in Chapter 47 she says that Wickham "has been profligate in every sense of the word; that he has neither integrity nor honour; that he is as false and deceitful as he is insinuating."

And Mrs Gardiner is very curious as to "the mode of her intelligence" - can she suspect it has the initials FD? - and then Elizabeth continues "I told you, the other day, of his infamous behaviour to Mr. Darcy; and you yourself, when last at Longbourn, heard in what manner he spoke of the man who had behaved with such forbearance and liberality towards him". Which might rather give the Gardiners a clue that her feelings towards Darcy (and Wickham) have changed.