Having learned my lesson, when I went through the other bookshelves in the house, I didn't solicit their help. Kara and I went through the board books in the school room and picked out all the nicer looking ones--they would be the ones that weren't favorites. (A well-loved board book is not usually in good enough condition to donate.) After collecting another box of books, I let the older children look through the children's books I had collected to make sure there weren't any of their favorites in the pile. Out of the hundred books they looked through, they only reclaimed five: Disney's "Knock, Knock! It's Pooh!" (a board book with a little Pooh faced door knocker on it), "Say Boo!" (a very thin Halloween book), "Scooby-Doo! in Jungle Jeopardy", "Let's Go Camping with Mr. Sillypants" (a very silly book), and "Born Yesterday: The Diary of Young Journalist" (a very odd book which Viva, our comics addict, wanted to keep).
***** Update! *****
Yesterday the older children hopped in the van to go with their mom to donate the books. She needed help carry the multiple boxes and bags in. While they were driving to and back from the donation location (Matt's office building--he's out of town), the children listened to their history lesson on tape. Homeschool is the best!