The Joseph husband of Charlotte mentioned above appears to have been the only son of the first Sir Joseph Mawbey (1) [1730-1798] and left no male heirs.
When Sir Joseph (2) died on 28 August1817, the baronetcy became extinct.
It had been created for his father on 30 July 1765.
Sir Joseph Mawbey (1) had a older brother John, and their father was also a 'John Mawbey'.
Both boys married their cousins - John, Martha Pratt, and Joseph, Elizabeth Pratt.
Sir Joseph Mawbey (2) married Charlotte Caroline Henchman on 9 August 1796.
According to Burke & Burke, Lady Elizabeth Mawbey died at Botleys Park estate on 19 August 1790 and was buried in the family vault in Chertsey chancel.
So it seems that in order to track down the parents of my George Mawbey, I have to go back further in time.
The last John Mawbey was the only son of the youngest son, William, of Erasmus Mawbey.
William was the youngest of Erasmus's seven sons born to his first wife.
Erasmus then had five more sons to his second wife.
So maybe George Mawbey descended from one of the remaining 11 Mawbey men (not counting William).
Alternatively, Erasmus's father Richard had a brother, Thomas, whose son William is described as the progenitor of the Mawbeys of South Kilworth in Leicestshire.