Frederick IX of Denmark sibling Prince Knud of Denmark
Changes to the Act of Succession
As King Frederick IX and Queen Ingrid had no sons, it was expected that the king's younger brother, Prince Knud, would inherit the throne, in accordance with Denmark's succession law (Royal Ordinance of 1853).
However, in 1953, an Act of Succession was passed, changing the method of succession to male-preference primogeniture (which allows daughters to succeed if there are no sons). This meant that his daughters could succeed him if he had no sons. As a consequence, his eldest daughter, Margrethe, became heir presumptive. By order of 27 March 1953 the succession to the throne was limited to the issue of King Christian X.
brother or sister kin