Robert Stuart, a younger son of the first Baronet, was created a Baronet in his own right in 1707. The Hon.
James Stuart-Mackenzie, a younger son of the second Earl, succeeded to the Mackenzie estates through his paternal grandmother and assumed by Royal licence the additional surname of Mackenzie. He was a member of parliament. The Hon.
James Stuart-Wortley-Mackenzie, second son of the third Earl, was a politician and the father of
James Stuart-Wortley, 1st Baron Wharncliffe.
Lieutenant-General Sir Charles Stuart, fourth son of the third Earl, was a distinguished soldier and the father of
Charles Stuart, 1st Baron Stuart de Rothesay. The Most Reverend the Hon.
William Stuart, fifth son of the third Earl, was
Archbishop of Armagh. His son
Sir William Stuart was a member of parliament. His eldest son
William Stuart also sat as a member of parliament.
Lady Louisa Stuart, daughter of the third Earl, was a writer.
Lord Evelyn Stuart, second son of the first Marquess, was a soldier and politician. Lord Henry Crichton-Stuart, third son of the first Marquess, was the father of
Henry Villiers-Stuart, 1st Baron Stuart de Decies (see the
Baron Stuart de Decies for more information on this branch of the family).
Lord William Stuart, fourth son of the first Marquess, was a
captain in the
Royal Navy and Member of Parliament. Lord George Stuart (1780–1841), fifth son of the first Marquess, was a
rear-admiral in the Royal Navy.
Lord Dudley Stuart, sixth son of the first Marquess (and eldest from his second marriage), was a member of parliament.
Lord Patrick Crichton-Stuart, second son of Lord Mount Stuart, eldest son of the first Marquess, was Member of Parliament for
Cardiff. His eldest son
James Crichton-Stuart also represented this constituency in Parliament.
Lord Ninian Crichton-Stuart, second son of the third Marquess, was also Member of Parliament for Cardiff before his early death in the
First World War.
Lord Colum Crichton-Stuart, third and youngest son of the third Marquess, sat as Member of Parliament for
Northwich for many years.
Lord Robert Crichton-Stuart, second son of the fourth Marquess, was Lord-Lieutenant of Buteshire. Lord
Rhidian Crichton-Stuart, fifth and youngest son of the fourth Marquess, was a British member of the International Legislative Assembly of the Tangier International Zone. The Earls and Marquesses of Bute originally used the courtesy title Lord Mount Stuart for the heir apparent. After the Earldom of Dumfries was inherited by the second Marquess, the heir apparent has been styled Earl of Dumfries and his heir apparent is styled Lord Mount Stuart. However, the current Marquess John Bryson Crichton-Stuart was styled as Lord Mount Stuart for some years after his father inherited the marquessate in 1993. This was because his father was well known at the time as
Johnny Dumfries, Earl of Dumfries. Subsequently, the seventh Marquess became known as John or Johnny Bute and his heir adopted Jack Dumfries for short. == Heraldic achievement (coat of arms) ==