I,ve started a game in 1081 (Alexiad) and I saw very... interesting thing - William the conqueror has 3 childrew with Ralf mab Ralf (MALE noble) and they are of that Ralf dynasty. No mods.
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Hehe, quite a silly error.
Chars 161428,16429,16430 in breton.txt should have their mother set to a new character (norman Emma Fitz-Osbern - dynasty exists but her family is not in the game) instead of 140 (Willy the Conker), alternatively just blanked.