As I was going about my normal end of day household duties tonight something dawned on me I never considered before. Vaughn Ohlman has stated that he has nearly all of his children married off now by using his betrothal methods of the fathers picking the spouses, paying the bride price and signing the betrothal contracts. This has happened over the last three years.
The first to marry of his six children was his eldest Joshua Ohlman when he married Laura Camp. He was perhaps 22 or 23 years old at the time. That means that he's around 25 years of age right now.
All of his siblings are younger than him. So if we extrapolate the likelihood of 18 months average between births it would make his siblings roughly 20, 18, 16, 14 and 12 when Joshua married, or if you go with one birth per year the ages would shake out as 21, 20, 19, 18 and 17. I think it's likely to be more accurate that there would be at least an 18 month span between siblings. Which would mean at least one of them was handed over in common law marriage before the age of consent.
Remember, Vaughn thinks anyone over 20 is an old maid/old man and wasting their God-given fertility.