Queen Elizabeth II, who took over the throne after the death of her father, King George VI, in 1952, has reigned over the nation for 70 years.
As the UK celebrates its longest-serving monarch in its history over a four-day long Platinum Jubilee weekend, the Queen has several generations of the Royal Family behind her - some part of the order of succession and others non-working members of the family.
She has four children, eight grandchildren and 12 great-grandchildren. While her son Prince Charles is the next in the order of succession for the throne, here's a look at the youngest members of the family.
Prince George of Cambridge
The eldest son of Prince William and Kate Middleton, Prince George of Cambridge was born on July 22 2013 at St Mary's Hospital in London, with his dad William present for the birth.
The third in line to the throne - after his father and grandfather - Prince George, who will turn nine in July 2022, began primary school in September 2017.
Princess Charlotte of Cambridge
Kate Middleton gave birth to the Cambridges' second child and only daughter, Princess Charlotte Elizabeth Diana, on May 2 2015. Like her brother she was born at St Mary's Hospital, once again with Prince William present for the birth.
Fourth in line to the throne, Charlotte - whose royal title is Her Royal Highness Princess Charlotte of Cambridge - turned seven in May 2022.
Prince Louis of Cambridge
Prince William and Kate Middleton welcomed their third child on April 23, 2018 at St Mary's Hospital with Prince William present just like he was for his other children.
Louis Arthur Charles of Cambridge is currently four years old and is fifth in line for the throne after his grandfather, father and two siblings.
Archie Harrison Mountbatten-Windsor
Archie Harrison Mountbatten-Windsor is the first child of Prince Harry and Meghan Markle, born on May 6 2019. He is now three years old.
The Sussexes, who stepped down as members of the Royal Family in 2020, have chosen not to bring him up as a royal, and he does not have a title like his cousins under strict rules put in place over 100 years ago.
Lilibet Diana Mountbatten-Windsor
The Duke and Duchess of Sussex welcomed their second child and daughter, Lilibet Diana Mountbatten-Windsor - known affectionately as Lili - in Santa Barbara, California on June 4 2021.
The Queen's 11th great-grandchild Lili, who is named after the monarch herself as well as Harry's late mother Princess Diana, is about to celebrate her first birthday.
August Philip Hawke Brooksbank
Princess Eugenie welcomed her first son August Philip Hawke Brooksbank with husband, Jack Brooksbank on F ebruary 9 2021.
Despite being a member of the Royal Family, Princess Eugenie doesn't not participate in royal duties. So her toddler son, who is the Queen's ninth great-grandchild, doesn't have a royal title either, though he is in line for the throne in the order of succession.
Sienna Elizabeth
Princess Beatrice welcomed her first child the same year as her sister Princess Eugenie. Her baby girl Sienna Elizabeth was born in September 2021 and is also in line to the throne.
Beatrice is also stepmother to husband Edoardo Mapelli Mozzi's son Christopher Woolf, known as Wolfie, from his previous relationship with Dara Huang.
Lady Louise Windsor
Lady Louise Windsor is the eldest child of Prince Edward and Sophie Rhys-Jones - known as the Earl and Countess of Wessex. Louise was born in 2003 and was given a "courtesy" title of Lady instead of princess.
The title was given because the Wessexes wanted to avoid putting the pressures and burdens of royal titles on their children.
James, Viscount Severn
James who is given the title of Viscount Severn is the younger child of the Earl and Countess of Wessex.
Born in 2007, James was given a courtesy title by his parents - like his sister Louise - instead of being given a royal title of prince.
Savannah Phillips
Born to Peter Philips - the eldest of the Queen's grandchildren - and Canadian Autumn Kelly, Savannah Phillips is the Queen's first great-grandchild.
Savannah, who was born in 2010, doesn't have a royal title because her father - born to Princess Anne - doesn't have a title either. This is because children of the Princess Royal do not have royal titles, as they are descended from the female line.
Since Prince Anne's first husband and Peter's father Mark Phillips refused an earldom, his children and grandchildren don't have courtesy titles either.
Isla Phillips
Peter and Autumn Phillips - who announced their divorce in 2020 - welcomed their second daughter Isla in 2012.
Like her sister Savannah, Isla doesn't have a royal title or courtesy title.
Mia Grace Tindall
The Queen's granddaughter Zara Tindall gave birth to her first child, Mia Grace, in January 2014. Zara, who married England rugby player Mike Tindall in 2011, remains 21st in line to the throne.
As a descendant of the female line of the Royal Family, Mia doesn't have royal title and is known simply as Miss Tindall.
Lena Elizabeth Tindall
The Queen's seventh great-grandchild Lena Elizabeth Tindall was born to Zara and Mike Tindall on June 18 2018, at Stroud Maternity Unit, Gloucestershire.
Given the middle name Elizabeth in honour of her great-grandmother, Lena also doesn't have a royal title and will be known as Miss Tindall, just like elder sister Mia.
