Kody buying Lot with HIS Money

One of the most memorable examples in my Law School Family Law class was explaining how money made during a marriage was community property. The thinking was, although one partner may be at home, that individual makes it possible for the other partner to work by taking care of the household, kids and providing other support that makes it possible for the working partner to work, so the money belongs to both partners. If that is the standard, I wonder how Kody classifies "HIS money" when he had three wives that were caring for so many kids and households, making it possible for him to do anything outside the home? Is it some sort of inheritance or something? I wish there was more clarity about the finances.