So me and my little storm undertook the task with nana. I have to admit the numbers were in my favour. Two adults an one child. But I can highly recommend it. Sit down together and colour with or without the book. Colouring was therapeutic for me and my storm.
It doesn't matter whether it's perfect. Just that you enjoy the process. Big bonus. You don't have to be able to draw. This obviously means anyone can do it.
Have fun and enjoy.