Living up to my maiden name Prude, I still believe that there must be a way to pervent a child from matching with it parnet. Game or no, there are those of us who would prefer this type of feature, even if we can turn it on or off like Easy, Normal and Hard.
But it is only a wish; I keep family records and rarely, only if the tribe is in danger of dying off, as in my last story, do I permitt siblings to match.
Just my opinion.