Dear A P:

You wrote:

May I please point out that your statement “Who (or its forms whom and whose) refers only to people” is incorrect. For example: “The houses, whose roofs were damaged in the storm are now being repaired …etc.”

Kind regards
A P

Thanks for the note. Elsewhere we actually have whose this way—but you are correct, in modern English it is used for all such possessives. Whose as an interrogative referring to a thing would be most unusual, but as a relative pronoun you are correct. We have clarified this point in our material.