Challenges have been made against the Act of Settlement, especially its provisions regarding Roman Catholics and preference for males. However, changing the Act is a complex process, since the Act governs the shared succession of all the Commonwealth realms. The Statute of Westminster 1931 acknowledges by established convention that any changes to the rules of succession may be made only with the agreement of all of the states involved, with concurrent amendments to be made by each state's parliament or parliaments. Further, as the current monarch's eldest child and, in turn, his eldest child, are Anglican males, any change to the succession laws would have no immediate implications. Consequently, there was little public concern with the issues and debate had been confined largely to academic circles until the November 2010 announcement that Prince William was to marry. This raised the question of what would happen if he were to produce first a daughter and then a son.