Father: King George VI (1895-1952)
Mother: Queen Elizabeth The Queen Mother (1900-2002)
Siblings:
- Princess Elizabeth (1926-2022), later Queen Elizabeth II
- Princess Margaret (1930-2002)
Uncle: King Edward VIII (1894-1972), later Duke of Windsor
Grandfather: King George V (1865-1936)
Grandmother: Queen Mary (1867-1953)
Great-grandfather: King Edward VII (1841-1910)
Great-grandmother: Queen Alexandra (1844-1925)
Great-great-grandfather: Prince Albert of Saxe-Coburg and Gotha (1819-1861)
Great-great-grandmother: Queen Victoria (1819-1901)
First cousins:
- King Charles III (born 1948), son of Queen Elizabeth II
- Princess Anne, Princess Royal (born 1950), daughter of Queen Elizabeth II
- Prince Andrew, Duke of York (born 1960), son of Queen Elizabeth II
- Prince Edward, Earl of Wessex (born 1964), son of Queen Elizabeth II
Second cousins:
- Prince William, Prince of Wales (born 1982), son of King Charles III
- Prince Harry, Duke of Sussex (born 1984), son of King Charles III
- Princess Beatrice of York (born 1988), daughter of Prince Andrew, Duke of York
- Princess Eugenie of York (born 1990), daughter of Prince Andrew, Duke of York
- Lady Louise Windsor (born 2003), daughter of Prince Edward, Earl of Wessex
- James, Viscount Severn (born 2007), son of Prince Edward, Earl of Wessex
Third cousins:
- Prince George of Wales (born 2013), son of Prince William, Prince of Wales
- Princess Charlotte of Wales (born 2015), daughter of Prince William, Prince of Wales
- Prince Louis of Wales (born 2018), son of Prince William, Prince of Wales
- Archie Mountbatten-Windsor (born 2019), son of Prince Harry, Duke of Sussex
- Lilibet Mountbatten-Windsor (born 2021), daughter of Prince Harry, Duke of Sussex