I absolutely love the Penderwicks and I love how Jeanne Birdsall writes about them. I have been savoring this book for a couple of months now - I'll read a few pages on my Kindle and then put it down, because I simply don't want it to end. I don't think I can explain quite why I adore these books so much. Part of it is the subtle humor, part of it is the sweet way the family interacts with each other (not too sweet, though -- it's not saccharine), and part of it, I think, is a hope that there are some families out there who are actually like this one!
In any case, I am almost done with the book, and I really hope Ms. Birdsall is planning to publish another one. Can't wait to read it!