Mom wasn't a tremendous reader; the three things I can think of from her shelves that weren't decorative items are a book of Agatha Christie's Miss Marple stories, Lauren Bacall's autobiography
By Myself, and the first four or five books from Howard Fast's
Immigrants series in hardcover. And yes, I've read them all both while I was still in school and as an adult, though only the mysteries have been repurchased in ebook form. I'm not sure how much of the
Immigrants books I remember at this point, it's been years and my TBR pile's a little too big to pick them back up again. I remember liking them well enough before though.
My grandmother read a bit more, but what I remember from her shelves would be things like Danielle Steel, Judith Krantz, and Jackie Collins...and I'm just not as interested in revisiting those.