Is there a risk of inbred children with fake fatherhood?

I got an event where my wife cheated on me and got pregnant, but I was unable to prove it. Now her son is listed as my legitimate son. We appear as father and son in family trees, relationship screens etc., even though his actual biological father is definitely someone else.
When I marry him to a close relative from my side of the family, is there a risk that their children will turn inbred? Common sense would say "no", but it seems like the game treats me as the biological father for all intents and purposes, so I have my doubts.
Best Answer
The game mechanics have an internal awareness of who the actual father was, this enables in game events to be triggered such as:
- "I am a bastard"
- "The father's wife is angered"
and my personal favourite:
- "I'm not your son. I'm your brother"
So IF the father is of a different family and you marry him off to a relative then there will be no risk of inbreeding.
That is IF the father is of a different family and that is a big IF, the real father will likely be someone in your court which could include your sons, brothers etc etc.
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Answer 2
It'd be based on their biological father (probably the other guy).
A character's real father is recorded in their stats. This is not normally displayed, but is visible in non-ironman save files or by entering charinfo into the console.
This means that you can safely marry your son to other dynasty members. On the other hand, you probably shouldn't marry him to anyone who might be his half-sister.
Bear in mind that the "but wasn't I away" event can happen with legitimate children, especially if you are paranoid. The child might actually be yours.
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