Well, silly me. I just figured out how my rouge villagers suddenly became a Master Parent and started sharing his gift with the ladies.

I had let him ring the gong, and it granted him wisdom. At the time, I didn't figure out that it had made him a Master Parent. But I just had another villager ring the gong that also was granted wisdom. She had already mastered 2 skills so when the gong made her a Master Parent, her totem appeared immediately on the spot. That's when the "duh" moment finally hit me.

Fortunately, the new Master Parent villager is a female 54 years old so she can't cause too much harm other than to disturb others from doing their job (and increase their parenting skill). But she can't cause my entire tribe to suddenly become pregnant like my other Master Parent.

BTW, my rouge villager started to father more children last night, but, fortunately, I was playing the game when he began. He got one female, but I stopped him. Once stopped, he went back to Researching like a good little pixelated male figure.