Research appears to indicate no relation of Thomas Willis as father the of Deacon John Willis.
. “THEORY - John Willis was born in 1610 the son of Thomas Willis who was born in 1575 in Fenny Compton, Warwickshire, England. “The Ancestry of John D. Newport” on Rootsweb lists a detailed pedigree of this family from a Thomas Willis born about 1450 in Priors Marston, Warwickshire to Thomas Wyllys born about 1575 in Fenny Compton, but does NOT account for a son JOHN WILLIS.
This family is DISPROVEN as relations to the brothers in Massachusetts. It is instead the family of George Wyllys of Hartford.
https://www.wikitree.com/wiki/Willis-93
Should Deacon John Willis be connected as son of Nathaniel Willis
I’m getting unclear looking at https://www.wikitree.com/wiki/Willis-93
More in Deacon John Willis and connected families:
https://books.google.com/books?id=YEhBAAAAMAAJ&pg=PA92&lpg=...