i am writing it frm ur side
first of all u can write that since i am an adopted son/ daughter i donot have the right to inherit both the properties
then u can say that the current ruler can decide the next emperor
then u can say that the emperor can take the skill test of all the men who want to be the emperor
these are just the basic points u can make the rest on ur own related to this
if this helps pls click on the smile and if not then the sad face
thank u