I have spending some time looking into John Corey who is the Uncle of James Bryant and Margery Rawlings nee Bryant, ( his Will proved 1762).
John Corey born Helston to James Corey 1690. James Correy was also father to Jone Correy born 1686. There is a death of Thomas Correy son of James Correy 1684, and death of James Corey, 1705 all in Helston.
Will of Margery Corey widow of Lelant, proved 1677 has daughter Jane Collings and sons Robert?, Nicholas and James.
James Bryant married Mary Morley 1730 in Lelant. Their children were James, Joan, Mary, Elizabeth and Thomas.
I still haven’t found James’ baptism but James could be the son of Thomas Bryant and Jone (Joan) Correy.
Mary Morley could be the daughter of James Murly and Mary Thomas born St. Erth 1712.
This is still speculating as I have not established who William Bryant’s parents are. William Bryant married Jane Nole/Note 11th June 1765.