Inbreeding

[unmerged(58245)]

Aloha!

Playing as King of Sicily with inheritance law where women can inherit (well not themselfs but sons). In this case, as I understand, a child from other realm can inherit my lands.

Ok, to the point: my great solution was to marry women of my family tree (blood icon on portrait) to males of my family tree (my vassals). This way I can assure titles stay at home. BUT, every other offspring (how I love to use this word along with Green day) is born with "inbreed" trait, making him walking vegetable in terms of the game. Question: does probability of having normal child increases if I marry together lets say third or fourth cousins instead of first or second ones?

I know I can always change inheritance law, but lets assume I don't want to :rofl:

 

[Kaleidoscope]

If you're using the DV expansion I believe the trigger for the Inbred trait is if the parents have the same grandarents. Not sure what the percentage chance is though.

 

[TempestDK]

I believe that the inbred chance is something like 40% .... but I am not sure. Might be 60% though, as they do seem to have mostly inbred children, but not every child is inbred.

 

[unmerged(58245)]

Thanks for info.

Funny thing happened. This couple had 4 children, all boys. Three of them "inbreed" and one normal. Yet the normal one died for unknown reason at age of 3. I wonder what would Darwin had to say about that kind of natural selection?

 

[Snaake]

He'd say that the inbreeding wasn't superficially obvious, but that it killed the seemingly healthy boy anyway. Or that it was pure random chance.

As said, inbreeding happens in DV if the characters have any same grandparents. I'm not sure how this works if you marry eg. your niece, which was pretty normal back in the day (if cousins are too close, I think this should be, but haven't tested and don't know how the code checks, ie. if it's "same grandparents" or "same ancestry in parents/grandparents"). I've only married men to their grandnieces though, so the man is his wife's grandparent's brother. I've also married cousins first removed (so eg. man and his cousin's daughter), which don't seem to be getting inbred children either.

In Vanilla CK, there's a chance of inbreeding as long as the surname is the same, so with some generic-named ruling dynasties, you can get random courtiers that spawn with their surname, and will cause inbreeding if they marry into the family.

 

[jordarkelf]

IIRC inbred has a chance of firing if the couple shares two grandparents. So a first cousin is dangerous, whereas anything further out is safe. Just like in reality.

In vanilla CK of course the system only checks the dynasty, so inbred is excessively common. In contrast DV's system is very realistic here.

 

[unmerged(133776)]

IIRC inbred has a chance of firing if the couple shares two grandparents. ...

Ah, and here I thought they only needed to share ONE grandparent. So if my Ruler had children with several different wives, it'll be safe to marry his grandson from his first wife to his grand-daughter of his 2nd wife (as long as there was no other common ancestry)?

 

[jordarkelf]

Just checked... I misremembered. It's one grandparent.
Your ruler's grandson and grand-granddaughter probably could marry if none of their grandparents are the same -- great-grandparents are far away up the family tree not to cause an issue (first cousin once removed situation if I get you right).

Hehe, Wolfram Alpha is a nice way to check this