Prince George, Princess Charlotte and Prince Louis will have to obey this royal wedding rule when they get married

The young royals are used to being guests at weddings but if they marry when they're older there is one vital rule they must follow.

Princess Charlotte
(Image credit: PA)

The Cambridge children, Prince George, seven, Charlotte, five, and Louis, two, will all have to get permission if they want to marry when they are older.

The will have to follow in the footsteps of their dad Prince William and uncle Harry who both had to seek permission from the Queen before they could get married.

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The rules apply because the young royals are all in line to the throne - Prince George is third in line, followed by Princess Charlotte who is fourth and then Prince Louis is fifth.

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As they are all currently above the sixth in line to the throne they are all bound by legislation which apply to senior members of the royal family, and should their position remain unchanged when they reach adulthood, it's understood they too will be bound by these marriage restriction laws.

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Iain MacMarthanne told Express.co.uk, "Prior to the Succession of the Crown Act 2013 all descendants of George II, under the terms of the Royal Marriages Act 1772, unless the issue of a princess who had married into a foreign royal family, had to obtain the sovereign’s permission to marry in order to retain their rights in succession.

He continued, "The 2013 Act sought to bring multiple pieces of outdated and discriminatory legislation relating to the monarchy up to date."

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Their father Prince William, 38, is second in line to the throne and he and his wife Kate, Duchess of Cambridge, 38, are future heads of the British Royal Family.

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While Charlotte and Louis' positions could slip further down the succession line, should Prince George one day have children, if this doesn't happen, they will all have to seek permission from the presiding sovereign when they marry.

Prince Harry also had to have his marriage to Meghan (opens in new tab) rubber-stamped before it could go ahead.

Selina Maycock
Senior Entertainment Writer

Selina is a Senior Entertainment Writer with more than 14 years of experience in newspapers and magazines. She currently looks after all things Entertainment for Goodto.com, Woman&Home, and My Imperfect Life. Before joining Future Publishing, Selina graduated from the University of Sheffield in 2006 with a degree in Journalism. She is fully NCTJ and NCE qualified and has 100wpm shorthand. When she's not interviewing celebrities you can find her exploring new countryside walking routes, catching up with friends over good food, or making memories.