It is one child in the cities, two for farmers (to also help keep them on the farms), and three for minorities. It averages out to about 1.7-1.8 kids per family. There biggest issue is the great leap forward pushed families up to 3-4 kids, their baby boom. The one child rule was so that all those large families didn’t have large families in turn.
Three for minorities? Aren’t they all Chinese (I’m aware that isn’t a completely uniform demographic)? And don’t the Chinese traditionally look down on foreigners?