When the Princess Royal was born in 1950, she was third in line to the throne behind her brother Charles and her mother Elizabeth. However, as the titles are passed down through the male line, she was then bumped down the list as younger brothers Andrew, now 60, and Edward jumped the royal queue for the crown.
So, as Gloucestershire Live reports, if Zara has a boy this year, his place in the line of succession in the Royal Family will be fairer than when Anne was born.
Anne, now 70, has fallen to 15th in line to the throne and her children – Peter Phillips and Zara Tindall – are now numbers 16th and 19th, respectively.
They’ve moved further down the list after Andrew, the Duke of York, and Edward, the Earl of Wessex, had children and Princess Eugenie gave birth recently. The Queen was “delighted” when Eugenie welcomed a healthy son, who weighed 8lbs 1oz, last month.
Savannah, Isla, Mia and Lena are 17th and 18th and 20th and 21st in line to the throne at the moment.
But if her brothers had not leapfrogged over Princess Anne, she would be eighth in line to the throne and her two children ninth and tenth, followed by their four children.
Zara is expected to give birth to the Queen’s 10th great-grandchild in early June – around the time the Duke of Edinburgh turns 100.
Mike Tindall, 42, has said he would like another man in their house at the Gatcombe Park estate in Gloucestershire but if he gets his way, his son will be hit by changes to the rule of male primogeniture.
This is the rule which allows a younger son to displace an elder daughter in the line of succession and was abolished in the 2013 Succession to the Crown Act which changed the provisions of the Bill of Rights and the Act of Settlement.
The ruling means that means Prince Andrew and Edward are closer to the throne than Anne even though she is older and regarded as one of the most popular and hardworking royals.
The new Act applies to those born after 2011 and until now Princess Charlotte is the only member of the Royal Family to benefit from this change by keeping her place in line despite the birth of Prince Louis.
Any new male baby born to the Tindalls will be second because he will not be able to queue jump their two daughters – Mia, aged seven, and two-year-old Lena.
Unless pregnant Meghan Markle gives birth to Prince Harry’s daughter before Zara Tindall, the Tindall’s newborn will be 22nd in the line of succession, whether it is male or female.
However, when Prince Harry and Meghan’s new daughter is born she will be able to queue jump at number eight and push everybody below down the line by one place.
Like her brother Archie and other great grandchildren, Prince Harry’s daughter he will not be automatically entitled to a title until Prince Charles comes to the throne.