Do your own children serve as inspiration for your books?

Strange to say, not a lot. I began writing and illustrating long before I had kids and the impetus was purely my own need to create. I had ideas for pictures and I wanted to make them real. Another strange fact is that my kids have probably read fewer of my books than many of their friends – my wife and I would always read to them but it just felt weird reading them one of my own books! Occasionally I have read them a draft manuscript (the original verse version of TruckDogs for instance, before it morphed into a novel) but this was rare.