As I told Lauder via PMs: y'alls is wussiez lrn 2 ManClan get wrekt nubcakez
Not really, though. I mean, I did say all that, but I didn't mean it. That was my Clan Party Hard persona.
Anyway: the in-game impact is you guys are expected to honor the traditions your ancestors showed to your thralls (I.E. treat them fairly and let the worthy ones become members of the clan). Also, your clan will have extra starting favors owed to it from other clans in the Hidden Valley thanks to having good relations with other Urlandi in ancient times, and you'll be better able to take advantage of and pay off favors.