I was gonna have mine go through the industrial revolution.

I set out on an adventure with 3 of 10 Mousekins and the One Big Family mod. I left a certain Mousekin behind who was a very, very beloved one and for some reason a pair of sisters, one his wife, the other his lover, met each other. I started with the wife being pragnant and the sister visited with a acaravan. For stupid malnutrition at the start, the baby was lost. At first they talked peacefully while I was keeping a close watch but as soon as I turned away, they started a social fight. Apparently the younger sister (wife) insulted the older one about their romantic interests. Well, the wife got a bad scratch on her eye while the lover lost almost both ears.

Mousekin relations are tricky... I wonder if their common aspiration of being grandparents is the reason...