How many villagers can you have if you have fixed one hut and have chosen the faction Nature? I want to plan ahead so that I don't wind up with no kids. I currently have thirteen villagers, two of whom are children.

Im not quite sure. I think its around 30. When you have all your huts I think its 90 for nature and 100 for magic

With no huts repaired, it's 10. With the first hut, it's 17. With the second hut, it's 35. After that, it's whatever the population limit is for the faction/collectibles.