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Inbreeding is based on how many of the last 4 generations the couple has matching. This is a grand total of 30 people 2 parents, 4 grand parents, 8 great grand parents, and 16 great great grand parents. The risk factor of inbreeding increases exponentially. Even at 14 matches there is only a 4.6% chance to get a negative trait. From there is starts jumping 15 has 11.25%, 17 has a 17% chance, 20 has a 40%, and 30 has 90%. If you do the math the only ways to get 15+ matches in a single instance are full sibling, parent to child, and half sibling relations. As long as your side the the family is clean and you avoid those options it can't go above 14. If the marriage partner is really the bastard child of your seduction focused brother they will be at 14 pairs giving them 4.6% chance a kid will have a new negative trait so the odds of 2 of their kids having new negative traits is statistically unlikely. Even then the inbred trait is reserved for inbreeding couples who already have a trait from the inbreed pool of traits which is barren/sterile, scaly, club-footed, wheezing, spindly, giant, hunchbacked, bleeder, and dwarf. If a couple with a match without one of those traits has a bad role it will result in one of those traits or pure blooded. If a couple with a match with one of those traits has a bad role it will result in inbred or pure blooded.
So only the last 4 generations count, the risk factor is tiny unless you keep doing something repulsive, and there will be decently bad traits before you will ever see the horribly bad trait.
Repulsive? Tell it to the early Egyptians or just maybe the Tsars? Of course I'm playing the Rurik the Trouble maker scenario right now and I decided to include a little eugenics 4 generations in, I've got about 6 geniuses in the extended family. No Bad Congenital traits have shown up yet and I'm starting to start a family branch that concentrates on Beauty. When they start inter-marrying a few generations from now I should be getting a few super rulers.
Also as long as you invest in the blood dynasty legacy and actually focus on heir quality rather then alliances you should never have that problem. marry your kids to peasants and low borns with inheritable traits and high stats, land these to create new noble houses and so forth.
after a few generations or perhaps earlier wit a little luck you should have the strong blooded trait unlocked and if you invested in the legacy have levels 3-4 of the legacy. then you'll be rolling around in genius heirs
I agree that would be very useful. Maybe have a portrait in the marriage UI of the characters causing the potential inbreeding issue, instead of a very vague "they are related" message. I'm not so worried if it is 3 generations back but if there was some sleeping around (as the AI has been known to do on occassion every chance it gets), it can throw off what lineage you're trying to trace. "oh but her mom wasn't great-great-great-grandpa's kid, it was the hunchbacked keeper of the swans"
You can pin a character by clicking on them. So if you find someone and check that person and it gives you the warning, just pin that character. You can then just cross check the list to eliminate any possible inbreeding