Well, this is not too surprising for me. I grew up in a small-ish village where there were quite a lot of people called lestadians
who are very, very conservative in their faith. Including no premarital sex and no contraception, it was common to see families with 15 kids or so. I suppose 20 kids would be rare but I bet they are there -an lestadian MP once stated he didn't feel like a father until his 18th one was born. Our neighbours were lestadians but had a very small family comparatively -only 6 kids.
My brother had a lestadian friend. Unfortunately as they weren't allowed to watch tv, whenever this kid would come to ours he'd insist on watching it, although my brother would've wanted to go out and play. He'd also stay in pretty much all day (this was during the summer holidays) and when my dad pointed out that it might be hometime and his parents might wonder where he was, he quite happily replied that his parents didn't care much (possibly didn't even notice) where he was. Funnily enough, the reason they don't watch tv is because of all the sexual and violent (eg. "Worldly") content on it, however they seem to be fine using the internet.