Sorry what? 19 children?! And in a 3 bed house?!!!
I also agree that having your own private space is important, even as a child. I know it's a bit 'first world problems' and all that, and people used to share a bedroom with 2, 3, and 4 siblings (even more sometimes) but still, that doesn't change the fact that people need solitude and their own private space. Coming from a huge family (who are not rich, and living in a normal house or flat, with 4 bedrooms or less,) and never having your own space is exhausting and not ideal for anyone...
In the families I knew in the 1970s, and 1980s the people who shared a room with a sibling - or 2 or 3 siblings, hated it, and couldn't wait to leave home. In every family, the older girls left home and got their own place before they were 20, because of having to share with 2 or 3 sisters... Boys stayed longer with mum and dad, but even then, they would usually leave by 23-24 at the latest.
Apart from couples, NO-ONE wants to share a room with other people, not even family, and if people were really honest, they would admit they would have preferred to have their own bedroom, rather than sharing one. At least after the age of 8 or 9. My brother and I had a bedroom each, and both of us would have been mortified at the idea of sharing, but we still always had a good, close relationship. We didn't need to share a bedroom to be close.