I’m old enough to have read the Chronicles of Narnia in the “right” order, with The Lion, the Witch and the Wardrobe first and The Magician’s Nephew sixth. In LWW, Professor Kirke (Digory from TMN) apparently lives alone, except for his staff. But IIRC (I don’t have any books from the series readily to hand, so I can’t check), in The Last Battle, Digory and Polly turn up again as the Lord Digory and the Lady Polly.
So presumably, they continued their association (how could they not?). But what is the deal, there? Are they Lord and Lady only in Narnia, while in modern-day England, he stayed single while she either married someone else, or also stayed single? Or were they married, and he attained Lordship status, making her Lady? If that’s the case, then where was she in LWW? In America for the duration of the war, perhaps? Or is this simply a continuity error?