Church leaders have told the British government that members of the royal family who marry Catholics under recently passed legislation will not be obliged to bring up their children in the Catholic faith.
The canonical requirement of Catholics to raise their children in the faith is not always binding.
For the first time in more than 300 years, new legislation would allow British monarchs to marry Catholics.
The bill means that if the child of Prince William and the Duchess of Cambridge, due in July, is a girl, she will have the right to rule ahead of any younger brothers -- and will also be free to marry a Catholic.
Some members of the House of Lords were deeply concerned that the Code of Canon Law of the Catholic Church compelled a Catholic spouse to raise his or her offspring as Catholics.