On 25 Sep 1728 [his uncle] William Blackett 2nd Baronet (age 38) died without issue. He was buried in Cathedral Church St Nicholas, Newcastle upon Tyne [Map]. Baronet Blackett of Newcastle upon Tyne in Northumberland extinct. His nephew Walter Calverley aka Blackett (age 20) inherited his estates at Allendale, Northumberland and Wallington Hall, Cambo on condition that he marry William's illegitmate daughter [his future wife] Elizabeth Orde Lady Blackett, apparently within twelve months although he was late by four days, and change his surname to Blackett, which he duly did. He changed his surname by an Act of Parliament in 1733.

On 13 Sep 1736 [his mother] Julia Blacket Lady Calverley (age 50) died.

On 15 Oct 1749 [his father] Walter Calverly 1st Baronet (age 79) died. His son Walter Calverley aka Blackett (age 41) succeeded 2nd Baronet Blackett of Claverley in Yorkshire. [his wife] Elizabeth Orde Lady Blackett by marriage Baronet Blackett of Claverley in Yorkshire.

On 21 Sep 1759 [his wife] Elizabeth Orde Lady Blackett died. She was buried on 28 Sep 1759 at the Cathedral Church St Nicholas, Newcastle upon Tyne [Map].

On 14 Feb 1777 Walter Calverley aka Blackett (age 69) died. Baronet Blackett of Claverley in Yorkshire extinct. He was buried at Calverley. His estates, in line with the will of William Blackett 2nd Baronet, passed to Thomas Wentworth 5th Baronet (age 50), the eldest surviving son of his aunt Diana Blackett Lady Wentworth.