Killing members of your own dynasty (and getting caught..) is a huge taboo in the world of Crusader Kings, so much so that if you get caught you get a -really- nasty trait. One that require Papal intervention to get rid of! But what about the secular lieges of that realm, have they no say in your obvious lack of honor? Now they do.
It all starts with personal reflection. If you aren't careful and acquire the Kinslayer trait, news will spread about your deed and you must confront the consequences.
Your liege gets a special opinion modifier in relation to you as a direct result of the last event. This modifier will allow him to attempt to bring you to justice, giving him righteous imprisonment against you.
Should the kinslayer lose the ensuing war they are cast into the dungeon, and their liege has the option to send them into exile for 70 piety (might change).
Living a life of exile, the Kinslayer is incredibly resentful, taking a nasty -30 to relations with their former liege.
The code for this is pretty rough, I haven't spellchecked it or implemented a couple events to allow the kinslayer to redeem themselves (although I've already got events where should you lose the trait, the liege can no longer imprison/exile.
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