Prince William and Kate Middleton are getting married in Westminster Abbey on 29 April The government is consulting Commonwealth countries about changing the laws on royal succession, Deputy Prime Minister Nick Clegg has said.
At present, the law of primogeniture means male heirs accede to the throne before any older sisters.
Mr Clegg, who is responsible for constitutional reform, told the BBC the issue would “require careful thought”.
But he said both he and David Cameron were “sympathetic” to changing rules which seemed “a little old fashioned”.
Speaking to the BBC, Mr Clegg said: “Prince William and Catherine Middleton might have a baby daughter for instance as their first child, I think most people in this day and age would think it’s worth considering whether we change the rules so that that baby girl then could become the future monarch.
“I think that would be in keeping with the changes that happen in society as a whole.”
But he said it was not a “straightforward” process because the decision would have to be approved by all Commonwealth countries.
“It’s something that affects other countries – New Zealand, Canada, Australia and so on – and we’re having consultations at official level with those governments,” he said.
“My own personal view is that in this day and age the idea that only a man should ascend to the throne I think would strike most people as a little old-fashioned.
“I think it is worth thinking about, I think it is worth talking about. It is worth looking at what other countries that would be affected also feel on the subject,” he added.
A Buckingham Palace spokeswoman said it was a matter for the government and would not comment.
The 1701 Act of Settlement which gives precedence to male heirs in the succession also bars any Catholic or anyone married to a Catholic from ascending the throne.
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