You got offtrack,his name is not James Ernest,it is Ernest John Plimsoll
Look at your 1901 Census,Rebecca Hore head of house.
Devon Marriages 1537-2002 . Charlotte Hore ( who is the daughter of George
Hore and wife Rebecca, marries Henry Collings Plimsoll, March 8 1876, Littleham
Exmouth Devon ,there son Ernest John Plimsoll thus Grandson of Rebecca Hore..
A must for research in England is Find My Past,and Ancestry. Com.