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Royal Marriages and Succession to the Crown (Prevention of Discrimination) Bill

Of course, the problem would exist if the heir to the throne married a Jewish woman. Under Jewish law, those children are automatically Jewish, and they could not therefore succeed to the throne. It is not a problem that is particular to Catholics—I guess that the same would apply to Muslims. The test is whether the monarch at the time of taking the oath is in communion with the Church of England or the equivalent in Scotland. The problem is not unique to Catholic parents who have married in.