Mum and my late Dad has similar arguments about his "finds" at the lifeline book sales. After he died my job was to clear out the bookshelves in his office - I couldnt do it. I kept crying. Mum managed by ruthlessly dividing the books into "work stuff", "game stuff", "I have NO IDEA" stuff. She kept two or three of the work books, and gave the rest away to Dads colleagues. She kept most of the game stuff (well I said we HAD to), and some of the no idea stuff...but I know how it feels to let it go... it hurts.