100% agree about not forcing, but you can gently encourage and expose kids to a wide variety of books to see what motivates them. Sounds like this is what you guys did and I'm glad it works out. I think we book lovers sometimes forget that we don't actually love ALL books, on the contrary its really specific authors and genres that are responsible for our motivation. It can be very difficult for kids to find the joy of reading when they are limited to graded readers and other phony school books.