As Princess Eugenie celebrates her 34th birthday today (Saturday, March 23), she will surely be spending the day with her husband, Jack Brooksbank, and two young sons, August and Ernest.
In the UK, there are several specific rules that explain which members of the Royal Family are entitled to hold a prince or princess title.
Many of these rules date from the 1917 Letters Patent, where he wrote that all the children of the sovereign, the male-line grandchildren and the Prince of Wales’s eldest son were all allowed to hold a princely title.
While Princess Beatrice and Princess Eugenie both have titles as they are male-line granddaughters of Queen Elizabeth II, their children are not entitled to become a prince or princess of the United Kingdom.
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