Problems with my heir

[needs a new name]

I am currently playing as Spain and my king's son is listed as infertile, he is 21 and is married but of course is not producing any children. I have Plenty of other family members through adoption and marriages and their subsequent kids, so my question is: If my faction heir dies as king without producing any children of his own, will the faction also die out or will one of the other family members become king?

[eXistenZ]

Normally one of the others will become king.

what you could do is remove the trait through the cheat console

[needs a new name]

I did that and gave him his wife every possible trait to improve fertility. And his brother is infertile too as well as their princess sister
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[needs a new name]

I think he sensed that I was about to have him march alone into a battle he couldn't win in hopes of killing him because he just had a son.

[Nazgûl Killer]

Generally if the heir or king do not produce an offspring they will adopt one, you must remember that that is indeed a possibility, however, if said thing does not happen, the brother of the heir will become the heir once he becomes king. Your family won't die out just because your biological bloodline stops.

I must say that I'd much rather if people did not cheat in order to have a more successful game, try and fight and muscle through the difficulties instead of making your life as easy as pie, it makes a much more satisfying game.

[Drustan]

If your king dies with no children, whichever family member has the highest authority ranking becomes king, if I'm not mistaken.

[MeMongo]

I always get the infertile traits for some of my family members, yet they always have kids! I never accept any adoptions or man of the hour events, so it may be that as I have lots of settlements and few family members, that the game decides they need to have kids sharpish