I'm currently using Gavelkind succession, and it looks like I might not have a chance to change it before I die. I currently have 2 sons and hold 2 duchies, so when I die they'll each get one - Obviously, I'd much prefer that not happen, and ideally I want the younger to be a vassal of the elder. Is there any way at all to arrange this?
I've read a suggestion elsewhere to give all my titles to my oldest son before death, but I'm not allowed to hand out the duchies since they're my highest titles. If my younger son inherits one of the duchies, but I've given my elder son all of the counties inside that duchy, then what happens? I guess The younger son inherits the title, but the elder son gets a de jure claim? And if he presses the claim he can declare war, but how does war work when one side has no demense or vassals, and hence no troops?