WOW @patriciabateman thanks for sharing that fascinating but tragic story of yours. Hope you are OK now!!!
@LemonShark
I also wondered whether the youngest are the biological children of mum and dad in the family, sadly wouldn't surprise me if they were result of incest.
EXACTLY what I said! The mother seems too old to have had the 2 or 3 youngest children, and I do wonder if the father (of all 13 children,) is the biological father of the youngest 2 or 3 children. (And the mothers, are the older daughters...) GRIM. 
Also not shocked to hear they are religious obsessives. Not just religious or someone with a faith, but deep into a cult-like state.
I am shocked though, to hear that several of the children are in their MID TO LATE 20's!!! 
And why is it that these deeply religious people (I mean to the point of being in a cult,) treat their own FEMALE relatives worse than we treat animals. Locked up, obeying the man, having sex on demand, no mod-cons or luxuries (as luxuries are sinful!) no booze or TV or video games, no mixing with other people, very little formal education for the girls, married off to some bloke in the cult.
Most religions when taken very seriously and literally, treat women like second rate citizens.
Not meaning to bash peoples faith, and I know some people who go to Church who are nice people, but you know the sort I mean!!! Even people who have a faith and go to Church a couple of times a month, cannot stand these type of people.