One of my in-laws came from a family of eleven. At some point the parents had a falling out and basically the marriage was ended although they still lived together and the father actually paid the mother a salary for the errands and such that she did for him. My SIL says she would have much preferred they divorced.
We knew a couple who basically split their house down the middle and bricked it up. He lived in one half, she lived in the other. The kids shifted back and forth.