Hello crewchief!
If you consider it too much, the blood-lines will drive you crazy. Some villagers do consistently run away from certain other villagers, but I have never two that I couldn't force to **kiss** if I was persistent. I like to secure the food supply, then turn one or two of my males into master parents. This helps the village continue on without as much hands-on interaction, and assuages my innate awareness of personal male chauvenism.
I always thought the Golden Child would be the 7th daughter of the 7th son of the Dalai Lama's personal manicurist, but it just didn't turn out that way. She looked more like Wonder Woman's bald disciple.
Anyway, it's a great game with lots of creative variations and possibilities, as you and your son have found out.