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.
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His youngest son, Rev John Alexander Blackett (1803-1865), in 1855 inherited the Whitfield, Northumberland estates of his wife's uncle, William Ord, and changed his name to Blackett-Ord.
He was the oldest son of Christopher Blackett, a Member of Parliament representing Northumberland South.
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William Hedley, Timothy Hackworth and Jonathan Forster all worked at Wylam Colliery for Christopher Blackett (1751-1829), and there produced the famous early steam engines Puffing Billy (1813-1814) and Wylam Dilly (1815)
Through the Wylam colliery and its owner Christopher Blackett, Hedley would have been familiar with Trevithick's engine.
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.