This is actually disturbingly close to an actual situation in CK3. Spoilered because it's pretty gross.
spoiler
CW: Incest
So there's an achievement in CK3 called "A Perfect Circle" for playing a character with exactly 2 each of parents, grandparents, and great-grandparents, essentially meaning you have to be the child of 3 generations of brother-sister inbreeding. At launch it was extremely difficult to get because the Seduction focus made characters cheat so much that the odds of having a child's genetic parents be its legal parents was shockingly low. Like I want to say less than half.
yeah the game is called ck3, that's what it's for.
like it straight up is about genetic traits inheritance and titulature inheritance, i don't remember how extensive the physical characteristic "genes" go but i'd honestly be suprised if they didn't involve tits to some extent, it's very complicated and detailed.
What's the fucking point of ruling a medieval kingdom if my court appointed fertility sorcerer can't use his bohangaloo calipers to create a Breastnostate where his roaming death squads of Inquisitits deport or purge booba criminals to enforce maximum milkers?