I actually think LotR had MORE of an emphasis on family tree relationships, despite being 'free form.' In KotR, family relationships meant relatively little after the first term or two. After that point, it was all about Duchy politics, most of which had little to do with relationships and everything to do with usual inter-House political struggles. In contrast, LotR was riddled with the Komnenoi-Tagaris feud. Those two families aligned against each other early on and their rivalries were pretty much the main plotline from the middle of the game until the end. Who was born to who and who was married to who played a big part in determining the allies of those two clans.
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