Crusader Kings II: A Game of Thrones

Currently playing as Aegon II and i have essentially won the war (100%) but Rhaenyras children are currently in hiding and so i cant capture and execute them (i found that killing people during war time does not incur tyranny) and the only way i have found to stop them from being in hiding is to end the war and then call court out of hiding but then it wont let me execute those strong bastards without tyranny, so should i take the tyranny hit or is there a better way?