They freely admit that they do -
from their FAQ -
"Child Training Tip-With 6 little boys age 5 and under we’ve enjoyed much more peace, harmony, & order in our home since a friend shared with us about ‘blanket time’. We began this training four years ago, when our second set of twins were 17 months old. They started learning self-control & obedience by sitting quietly on a blanket playing with a few toys. The key words are ‘sit’ & ‘quiet’! At first, we practiced 5 minutes, 2-3 times a day, & worked up to 10-20 minutes at a time. This one tip has changed the atmosphere of our home tremendously. We don’t have little ones tearing up the house as often & getting into things while we are busy. Occasionally, we still have those moments, but over all the little ones are content. This frees us to be able to accomplish more in our day! We have since, transferred this training to other areas, such as sitting during worship services, shopping trips & when visiting with company…etc. It’s teaching them responsibility (knowing & doing what both God & others are expecting of them) at an early age. "