I have been playing as the Volga Bulgars lately, despite doing fairly well (and crushing the golden horde --> a nice bonus) i have had one problem...my royal family, the last 4 khans have all been useless, with no more than 2-3 influence, and 1-3 command...

is there a way to improve them through obtaining vices/virtues, or can i change the royal family through assasination etc. (i have several v good generals who i'd quite like as khan :D )

any solutions welcome