I've heard them mention this before, and what I really liked about it was that they don't homeschool only because of their crazy schedules. They have mentioned that they homeschool because they don't like the atmosphere and the education that is our current school system.
Slightly OT: It seems like I always love what they have to say. I remember Jada Smith being asked by Oprah about her embracing Will's ex wife as part of their family, and her response was along the lines of "There is no way for me to accept the child while rejecting the mother - his mother is 1/2 of who he is." Coming from divorced parents who spent 10 years not speaking and disparaging each other, it brought tears to my eyes to hear that someone else gets this.