Just a rant
By - thealbinorhino504
Could try changing succession law to Seniority or Elective for a generation
Too low tech :( good idea though
If you have advanced enough innovation , Designate heir +House seniority should work.
if not check Czech if they already have one (table of princes innovation) attack them >move capital there and convert culture for now.
Or Try elective succesion(feudal elective) from duchy up to kingdom and empire.(you are going to need a lot of prestige)
start with kingdon title that u have duchy title for as it should be automatically transfered to that elected person.
Meanwhile eat those tyrany by try jailing you kids and put them into the dungeon as much as your character's fragile mind can handle.
This is still doable.Good luck getting that achievement.
Also Make sure your character choose medicine focus .You gonna need those less stress gain perk and more time to deal with this.
Great suggestions! Not innovated yet though, just reached early medieval and got partition first.