Last season, the last show called A Little Q&A, at about 34 minutes in. Jen says the kids have no problem telling to camera to go away. They show one clip with Jen when Will says he doesn't want to be filmed and Jen says tell them to go away. There is a clip of Will coming out of the bathroom. I think the kids love the crew, and for the most part don't mind being filmed. That's all they have known since they got their parents. I do think like all of us there are times when they don't want to be bothered. Jen and Bill have obviously made sure that the kids can always say no. Why would Will have to write on a camera or squirt water? All they have to do is say no.