I had one village where I kept a family tree in PowerPoint using the org chart feature. It got really, really complicated, but I prevented incest for the early days of the tribe. Since there were more women than men in the beginning and I wanted to grow my population, I had one male tribe member who was "married" to a female and he also had a mistress. I kept track of all the "illegitimate" children in the family tree org chart too. It was a fun little project.

Then, as the tribe progressed and they began to waste time doing laundry and enjoying the pond, I noticed that, while I wasn't keeping watch, my men were spreading their seed to females within their own family. I tried, at first, to keep track of that too in my family tree org chart, but it became too difficult. I decided that it was impossible to prevent incest.

It is my #1 beef with VV 1 & 2 also.