In my current one, the second child inherits. It makes about as much sense as the eldest being heir or having a matriarchy or patriarchy. Plus, if I get bored, I can have a younger child off its siblings. Founder is a former porn star who wanted to be an architect (you know those architectural students, just trying to make a quick buck and ending up in Mexico taking their tops off for money). She started out dating a former costar and ended up with a police cadet (now on the Vice Squad). She and the husband are getting moldy while their daughters grow. At one point they had seven cats.
I had two brothers decide to (happily) share a wife.
Free Love Cult! Most of my instances of that were just random playables/townies who had great chemistry. Once I did have a brother/sister twin pair who married the same woman. That was in the story I linked.
Zaza, your file does not download well.
I tried it at work and was in agreement. Tried it back at home and it works. I think WinZip doesn't like it. WinZip is bitchy, anyways. WinRar is better.