WI: Rurik's brothers, Sineus and Truvor, live longer

According to my sources, the scandinavian-born king Rurik of the Rus' had two borthers, named Sineus and Truvor. They both had estabilished themselves alongside Rurik among northern Russia. However, they both died prematurely, leaving Rurik to go on and reign alone, founding the state of the Kievan Rus'.
But what if Sineus and Truvor had lived longer? Would there be a dispute over the russian leadership?
 
Well, I guess that would depend upon their personalities, of which I know little. But it's hard to conceive of it not causing strife, eventually. That seems to have been the pattern in Scandinavia.
 
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