Hi Marilyn,
My father is also searching for a Herbert
Thorpe Callister, born November 19th 1903 in Marown, Isle of Man.
He was the son of John James
Callister and Mary Emma
Thorpe (b.1876).
Herbert's grandmother lived in
Greenfield,
Yorkshire.
Herbert went missing in his late teens from Ellesmere Port.
From what you've said, your grandfather was born some 20 years earlier...