I finally worked back to John Henwood born 1538 in Medstead, Hampshire, England. He had a wife named Anne born in about 1540. They had five children:
Sibbel, Joan, Thomisen (a girl), Alice and Guy.
All the Henwoods have managed to stay either in the county of Hampshire or next to it. I've found no one in Cornwall so far, unless it happened before 1538.