Alexander Macdonald, 1st Baron Macdonald

On 3 May 1768 Lord Macdonald married Elizabeth Diana Bosville (1748–1789) at St Giles in the Fields, London. She was the eldest daughter of Godfrey Bosville IV of Gunthwaite and of Thorpe Hall, Rudston, both in Yorkshire, and sister of the ardent Whig Colonel William Bosville (1745–1813). They had seven sons and three daughters, including:^[2]

• Hon. Diana Macdonald (1769–1845), who married Rt. Hon. Sir John Sinclair, 1st Baronet, son of George Sinclair of Ulbster, in 1788.^[2]
• Alexander Wentworth Macdonald, 2nd Baron Macdonald (1773–1824), an MP for Saltash who died unmarried.^[4]
• Godfrey Bosville Macdonald, 3rd Baron Macdonald (1775–1832), who married Louisa Maria La Coast, the illegitimate daughter of Prince William Henry, Duke of Gloucester and Edinburgh (a son of Frederick, Prince of Wales and a younger brother of King George III) and his mistress, Lady Almeria Carpenter (a daughter of the 1st Earl of Tyrconnell).^[5]
• Hon. Archibald Macdonald (1777–1861), who married Jane Campbell, daughter of Duncan Campbell of Arneave, in 1802.^[2]

Lady Macdonald died in 1789. Lord Macdonald survived her by six years and died in September 1795. He was succeeded in his titles by his son Alexander.^[2]

Through his daughter Diana, he was a grandfather of thirteen grandchildren, including Sir George Sinclair, 2nd Baronet, a writer and an MP for Caithness who married Lady Catherine Camilla Tollemache; John Sinclair, who became Archdeacon of Middlesex; Capt. Archibald Sinclair of the Royal Navy;^[6] the Rev. William Sinclair, was Prebendary of Chichester (and was the father of Archdeacon of London William MacDonald Sinclair); and author Catherine Sinclair.^[2]

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