The reason I posted the 1901 census was to try and link William jnr to a family. Whilst it records that he is a grandson does not indicate he is the son of James.
It would appear that William senior was born
WILLIS, WILLIAM HAWKINS
GRO Reference: 1875 J Quarter in TIVERTON Volume 05B Page 417.
His mother Jane remarries twice, 1st to James King in 1886 and 2nd to Thomas Fouracre in 1896.
John