In the middle ages, it wasn't uncommon to have multiple concubines and mistresses, (BTW, what is the difference?) A man might have multiple kids by multiple unknown concubines. If you can't identify which kid came from which mother, do you set them all as if they came from one concubine; do you set a different concubine for each kid? One profile for an early monarch as concubines 1 through 7 or 8, all unnamed, some with the same kids. and some with no kids.