You bet - nearly useless, because it's some random theoretical article that can't be applied. (Major children included in the family? What age are we living in?)
Maybe if you run some kind of own business, you can pay each family member a salary and yourself and earn this much tax free - but it's not much use to those that have disproportionate distribution of income.
One thing though: If you are the most taxed person in your house, you should gift your post tax savings to your spouse for them to earn interest income (so they get taxed lesser)
