King Charles has a say on the future partners of his grandkids, according to a report.

The reigning monarch has many powers, including the final say on his grandchildren's romances. Traditionally, those in the line of succession must marry someone "suitable." Although the palace's approach to royal relationships has changed with a "commoner" like Kate Middleton in line to become the future queen, the British monarch still has the power to either approve or disapprove of his grandkids' future partners due to the Succession to the Crown Act 2013, the Mirror reported.

The law, which came into force in 2015, requires the first six individuals in the line of succession to get the monarch's permission to marry if they want themselves and their descendants to remain in the line of succession. So, King Charles has the last say on Prince George, Princess Charlotte, Prince Louis and Archie's marriages. However, the law doesn't apply to Prince Harry and Meghan Markle's daughter Lilibet, the seventh in line to the throne.

Royal family
Britain's Prince George of Wales, Britain's Prince William, Prince of Wales, Britain's Prince Louis of Wales, Britain's Catherine, Princess of Wales, Britain's Princess Charlotte of Wales, Britain's King Charles III and Britain's Queen Camilla wave on the balcony of Buckingham Palace after attending the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. HENRY NICHOLLS/AFP via Getty Images

While the law may sound harsh, it is reportedly an amendment to The Royal Marriages Act 1722, a more Draconian rule. The previous law included conditions under which royals could contract a valid marriage. All members of the royal family, even those way down the line of succession, could not marry under 25 without the monarch's consent.

Prince Harry shared his experience asking for the Queen Elizabeth's consent when he decided to marry Markle in 2017 in his 2023 memoir "Spare." According to him, his grandmother didn't look patient when he approached her.

Royal Family
 (From L) Britain's Prince George of Wales, Britain's Prince Louis of Wales, Britain's Prince William, Prince of Wales, Britain's Princess Charlotte of Wales, Britain's Catherine, Princess of Wales, Britain's King Charles III and Britain's Queen Camilla wave from the balcony of Buckingham Palace after attending the King's Birthday Parade, "Trooping the Colour", in London, on June 15, 2024. JUSTIN TALLIS/AFP via Getty Images

"I saw her waiting for me to speak, and not waiting patiently. Her face radiated: 'Out with it.' I coughed. 'Granny, you know I love Meg very much, and I've decided that I would like to ask her to marry me, and I've been told that, er. that I have to ask your permission before I can propose,'" Prince Harry wrote.

"'You have to?' 'Um. Well, yes, that's what your staff told me, and my staff as well. That I have to ask your permission'. I stood completely still, as motionless as the birds in my hands. I stared at her face, but it was unreadable. At last she replied, 'Well, then, I suppose I have to say yes.'"

Princess Charlotte, Prince George and Prince Louis
(L-R) Prince George of Cambridge, Prince Louis of Cambridge and Princess Charlotte of Cambridge bow their heads as they receive a salute as the Royal Procession returns to Buckingham Palace during the Trooping the Colour parade the Trooping the Colour parade on June 2, 2022 in London, England. Jonathan Brady - WPA Pool/Getty Images
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King Charles, Prince George, Princess Charlotte, Prince Louis, Archie