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[Martok]

Uh, well I might be missing something about the heirs though... I've seen that the heirs usually are High command if the king has, but is there some official rules about the heirs stats when they come of age?

Not really, no. A faction leader with good stats will on average have sons with good stats, but there's no way of predicting exactly what they'll be. It's partially randomized, with the faction leader's high stats merely improving the odds of what his sons' stats will be.