The Queen's youngest son, Prince Edward, married Sophie Rhys-Jones in 1999. Together the couple have two children, Lady Louise Windsor and James, Viscount Severn. However unlike some of their royal cousins, Lady Louise Windsor and James, Viscount Severn do not hold the titles of Prince and Princess.
Sophie and Edward's children are styled as the children of an earl, rather than a prince.
The children are also in possession of His and Her Royal Highness (HRH) titles, but the children do not use them.
According to Sophie, who recently spoke to The Sunday Times Magazine, she thinks it is "highly unlikely" either of her children will ever use the titles.
She said: "We try to bring them up with the understanding they are very likely to have to work for a living.
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"Hence we made the decision not to use HRH titles.
"They have them and can decide to use them from 18, but I think it's highly unlikely."
Lady Louise is soon to complete her GCSE's, and Sophie said she hopes her daughter will decide to go to university in the future.
She added: "She's working hard and will do A-levels.
"I hope she goes to university. I wouldn't force her, but if she wants to.
"She's quite clever, so I think probably, whereas James I don't know."
Although their grandmother is the Queen, Sophie detailed how James and Louise have had a relatively normal upbringing.
Like their peers, Louise and James visit friends for parties and sleepovers and are busy at the weekends.
Sophie added that both children also spend a lot of time with their father, Prince Edward, who takes James fishing and Louise horse riding.
Sophie and Edward's decision to raise their children without HRH titles is not unheard of in the Royal Family, and is likely to become more common for future royals.
Meghan Markle and Prince Harry's son, Archie Harrison Mountbatten-Windsor, is also without a royal title.
Princess Anne is said to have declined the Queen's offer of titles for her children, Zara Tindall and Peter Phillips.
Zara has since gone on to have a successful career as an equestrian, and is free to pursue her own income.
Zara won a silver medal at the London 2012 Olympics in the sport, and has since taken on a role as non-executive director at Cheltenham Festival.
In 2015 Zara revealed to The Times she was grateful for her lack of royal title, and felt "very lucky" for her parents' decision.
"I'm very lucky that both my parents decided to not use the title and we grew up and did all the things that gave us the opportunity to do."