You have answered your own question. Britain only has one Royal Family and Balmoral Castle is their summer residence.
Balmoral Castle is the summer holiday home of the British Royal Family.
Balmoral, in Ayrshire. Still one of the Royal Family's favourite residences
Balmoral Castle, Royal Deeside
Origin goes back to 1390. Bought by Royal Family in 1852
The residence is named Palace of Holyrood House. You can read more about it, below.
Balmoral Castle is the summer holiday home of the British Royal Family. They go there every year during the month of August. It was first used by Queen Victoria and her Consort Prince Albert in the 1840's and has been used by every Monarch since then. When the Royal Family is not in residence, parts of the castle are open to the public.
Queen Elizabeth and most of her family traditionally spend the summer at Balmoral Castle in Scotland.
They spend weekends at Windsor Castle in Berkshire, Christmas and New Year at Sandringham in Norfolk and their summer holidays at Balmoral Castle in Aberdeenshire, Scotland.
Balmoral Castle, which has been owned by Britain's royal family since the reign of Queen Victoria in 1852. It is a favorite residence of Queen Elizabeth II when she is away from Buckingham Palance in London.
Their official home in Scotland is called The Palace of Holyroodhouse , but they also have a home in the Highlands called Balmoral Castle.
Buckingham palace, Windsor Castle & Frogmore, Osborn House, Sandringham, Holyroodhouse, Balmoral Castle. Kingston Palace,Froggal Maison in Malta.... Queen Victoria lived much of the time in Buckingham Palace in London. She also spent time in Balmoral, in Scotland, and in Osborne House on the Isle of Wight.