The thing is, there's a heck of a lot of infrastructure that goes into making one a prince. You've got to basically rewrite the family trees of hundreds (thousands? millions?) of people. Whether this sort of thing is very stable or very unstable once done I just don't know.
Not necessarily. Prince Philip (of the UK) became a prince by marrying a princess (Elizabeth Windsor, the king's eldest daughter and heir). A prince could also be adopted, or even granted the title of prince by a popular assembly...
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