PRINCESS BEATRICE and Princess Eugenie, while not being working members of the Royal Family, are referred to as Princesses. However, according to a royal historian, the York sisters’ Lady titles were “vetoed,” whereas Lady Louise Windsor’s title was decided upon when she was born in 2003.

Prince Andrew and Sarah Ferguson’s two children have bestowed Princess titles from birth as the Queen’s second son, making them Princess Beatrice and Princess Eugenie of York. Despite being a grandchild of the Queen via the male line like Beatrice and Eugenie, when the Queen’s third son Prince Edward received his daughter Lady Louise Windsor in 2003,

She was not titled Princess Louise of Wessex. The discrepancy between the royal titles of the Queen’s granddaughters was discussed by royal historian Marlene Koenig for Express.co.uk.

Only the children of the Sovereign, the Sovereign’s grandchildren via the monarch’s sons, and the oldest son of the eldest son of the Prince of Wales are eligible to a Prince or Princess title in the Royal Family per the 1917 Letters Patent given by the Queen’s grandfather, King George V.

So through their father Prince Andrew, Beatrice and Eugenie were eligible for their Princess titles at birth under this convention.

Beatrice and Eugenie, despite their royal titles, are not working members of the Royal Family, despite hopes that they would be when they were born in 1988 and 1990, respectively.