Wickham had a conversation with Elizabeth in which they talked about Darcy. According to Wickham, how was he related to Darcy's father?

Wickham claims that Darcy's father was the truest friend he ever had.

His father, Miss Bennet, the late Mr. Darcy, was one of the best men that ever breathed, and the truest friend I ever had; and I can never be in company with this Mr. Darcy without being grieved to the soul by a thousand tender recollections.