Several generations of my family, from Michigan, Ohio, and Indiana, have always used "folks." I was unaware that the term was unusual elsewhere. "Folks" is used to refer to people generally, or to specify parents. In the early years of my marriage, I was caught between being uncomfortable addressing my in-laws by first name (since they had never indicated to me that I should) or addressing them by honorific and surname (which I was sure would offend them as well, as inappropriately formal and distant), and finally settled on addressing them not at all if I could avoid it, or when unavoidable (such as in the greeting in a letter), as "folks."
Parlors definitely remain. In current practice hereabouts, a formal room at the front of the house, usually smallish compared to the great room or family room, is often called the parlor.
And, oh yes, closets! Practically the biggest concern of a homebuyer is how many closets, and how big? What other terms are there for built-in enclosed storage areas?
