Short version: I know that a regency can be established by the next in line to the throne taking over if the current monarch is incapacitated, i.e. the Prince Regent taking over when his father was mad. But does it have to be the heir apparent to the throne who takes over?
Long version: My WIP, A BRAVER THING, involves an alternate-reality House of Windsor. In this universe, Edward VIII never abdicated the throne, he married Wallis Simpson (basically, society was one step ahead of ours, and the prejudice of royalty marrying a divorcée thing wasn't completely out of the question), they had a son who became Richard IV and a daughter, the Princess Royal, Princess Mary. Richard has a son very late in life, Prince Malcolm, and when Richard dies he leaves 18-year-old Malcolm on the throne. Princess Mary's 35-year-old son, Prince Stephen, is the amibitious, conniving antagonist, and basically attempts to bully Malcolm into making him regent or all-out abdicating, because Malcolm is unsure what to do (does he live his life before taking the throne? Go to university? etc).
In this case, would Malcolm be able to bypass Stephen, who is heir apparent, and make his aunt, Princess Mary, his regent? Or would Stephen have to be the regent? Or would this be the kind of thing a medieval war would be started over and there are no technical rules?
Long version: My WIP, A BRAVER THING, involves an alternate-reality House of Windsor. In this universe, Edward VIII never abdicated the throne, he married Wallis Simpson (basically, society was one step ahead of ours, and the prejudice of royalty marrying a divorcée thing wasn't completely out of the question), they had a son who became Richard IV and a daughter, the Princess Royal, Princess Mary. Richard has a son very late in life, Prince Malcolm, and when Richard dies he leaves 18-year-old Malcolm on the throne. Princess Mary's 35-year-old son, Prince Stephen, is the amibitious, conniving antagonist, and basically attempts to bully Malcolm into making him regent or all-out abdicating, because Malcolm is unsure what to do (does he live his life before taking the throne? Go to university? etc).
In this case, would Malcolm be able to bypass Stephen, who is heir apparent, and make his aunt, Princess Mary, his regent? Or would Stephen have to be the regent? Or would this be the kind of thing a medieval war would be started over and there are no technical rules?