Thanks to Kite, I had a wonderful time, trawling through will transcripts and browsing the registers.
I remain (relatively!) confident that James was the grandson of Richard d 1631 and probably the son of Richard bur feb 21 1649/50.
I am puzzled by his son James, bp 1681. His will mentions four underage daughters: Elizabeth, Frances, Lavinia and Margaret. He appears to have married late in life c 1725, and his wife, Grace, predeceased him. His will describes him as of St Audrey, Somerset:
http://interactive.ancestry.co.uk/51...nSearchResults
Lavinia seems to have married William Fellowes in 1765 in London.
http://interactive.ancestry.co.uk/16...nSearchResults
Elizabeth and Frances married Molesworth brothers in the 1750s: see
http://ukga.org/england/Cornwall/visitations/ page 328.
But then who is Dorothy, daughter of James who married Luke Glubb on p 580? They married in 1715? I can't see that she belongs to "my family" as she is not mentioned in either James senior or junior's wills. Any ideas?