The children and male-line grandchildren of the monarch are princes/princesses. So are the children of the eldest son of the Prince of Wales. This is in accordance with Letters Patent issued by King George V in 1917, and by Queen Elizabeth II in 2013.
When a woman marries a prince she becomes a princess. But if a prince is bestowed with a peerage on his wedding day, then he and his wife use that title instead. For example, HRH Prince William became HRH Duke of Cambridge when he married Catherine Middleton in 2011.
His wife is therefore known as HRH The Duchess of Cambridge instead of HRH Princess William. HRH Prince Michael of Kent, however, has no peerage, so his wife is known as HRH Princess Michael of Kent. The Queen's youngest son is an exception.
HRH The Prince Edward was created an Earl rather than a Duke, and his children use the titles of an Earl's children (Viscount and Lady), even though they are male-line grandchildren of The Queen, and are legally speaking prince and princess. This was done with permission of HM The Queen to provide a more normal upbringing for the children, and also to allow for Prince Edward to inherit the Dukedom of Edinburgh when his father passes.
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