Why do Prince and Princess Michael’s children have the titles of Lord and Lady and not Prince and Princess?
When King George V created the House of Windsor in 1917 he ruled that only the sons of a brother of the king would be princes with the title of Royal Highness. Their children would have the style and title of the sons of non-royal English dukes. The eldest son of the Duke of Kent is the Earl of St.Andrews and he will inherit the title of Duke of Kent but not the HRH. The children of a second son, as in the case of Prince Michael, have the style and title of the younger children of a non-royal English duke. This was done to avoid the situation in many European aristocratic houses where everyone is born with their father’s title and they are often very numerous.
