Well I think winning great battles in a heroic way doesn't suffice to get a new family member... Because I do that rather frequently and nothing happens.
But I have stumbled upon a strange thing with the AI. I tried to kill all Egyptian family members using assassins (it should be possible) but they simply keep adopting captains on the field. In an extreme case I killed a general off from leading an army, one turn later they had gotten another one from that army whom I had put to death, too, but: once again, one turn later they got another general there!
It seems to me that the chances of a general getting available to adopt him increase drastically if you only have a few (say, 2) family members alive, making my attempt to destroy the faction as good as hopeless.
Maybe our beloved dev might say something about that :) (hopey)
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