MEGHAN Markle and Prince Harry's first child will be the Queen's eighth great-grandchild and seventh in line to the throne.
The royal couple announced Meghan is due to give birth in spring 2019. We explain you need to know about the baby's older cousins.
How many grandchildren are there?
The Queen had four children herself: Prince Charles, Princess Anne, Prince Andrew and Prince Edward.
Each of her children had two children.
Prince Charles had Princes William and Harry with the late Princess Diana.
Princess Anne had Zara Tindall and Peter Phillips with Mark Phillips.
Prince Andrew had Princess Beatrice of York and Princess Eugenie of York with Sarah Ferguson, Duchess of York.
And Prince Edward had Lady Louise Windsor and James, Viscount Severn, with Sophie, Countess of Wessex.
How many great-grandchildren are there?
Of the Queen's grandchildren, three have children.
The most famous are Prince William's three children, who are next in line to the throne after him.
The Duke and the Duchess of Cambridge have Prince George, five, Princess Charlotte, three, and little Prince Louis, one.
But her first great-grandchild came from Peter Phillips, who married his wife Autumn Phillips, née Kelly, in 2008.
The couple welcomed Savannah Phillips in 2010, and then Isla Phillips in 2012.
Around six months after Prince George was born, Zara and Mike Tindall welcomed daughter Mia in January 2014.
In June 2018, Zara gave birth to her second daughter Lena Elizabeth, who she named after her grandmother.
What is the age difference between the royal cousins?
Prince Louis could be in the same school year as Lena Elizabeth, with them being born less than three months apart.
And the age difference between the majority of the great-grandchildren is fairly slim, with only eight years separating the eldest with Zara’s youngest daughter.
That means there will be nine years between Savannah and Meghan and Harry's little one.
The Queen's children had a 16-year gap between the eldest and the youngest, with Prince Charles born in 1948 and Prince Edward born in 1964.
The Cambridges have a cousin on their mother’s side.
Kate Middleton’s sister, Pippa, her first child with husband James Matthews.
Arthur was born in October.
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