His father, was a successful businessman at Jarrow and Gateshead and retired to Hoppyland, County Durham.
Blackett was the son of William Blackett and his wife Julia Conyers.
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He bequeathed his estates at Allendale, Northumberland and Wallington Hall, Cambo to his nephew Sir Walter Calverley, 2nd Baronet of Calverley, conditional upon the latter's marriage to Elizabeth Orde, Blackett's natural daughter and his change of name to Blackett.
The hall house was rebuilt in 1688 around the ancient Pele Tower house for Sir William Blackett and was later substantially rebuilt again, in Palladian style, for Sir Walter Blackett by architect Daniel Garret, before passing to the Trevelyan family in 1777.
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The Blackett Baronetcy, of Newcastle-upon-Tyne in the County of Northumberland, was created in the Baronetage of England on 23 January 1685 for William Blackett, third son of the first Baronet of the 1673 creation.
John Blackett (died 1714) was the son of John (above), grandson of Christopher Blackett of Hoppyland (1612-1675) and the greatnephew of Sir William Blackett.
Blackett was born a Blackett of Wylam and the eldest son by the second marriage of John Blackett, a High Sheriff of Northumberland, whose family descended from Christopher Blackett, an elder brother of Sir William Blackett, and Alice Fenwick, sole heir of her father.
Blackett was the eldest surviving son of William Blackett and his wife Elizabeth Kirkley.
In 1757 he married Anne Douglas, daughter of Oley Douglas and heiress of Matfen, Northumberland and was succeeded by their son William.