Brian, I found their marriage source.
"South Africa, Natal Province, Civil Marriages, 1845-1955," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KDCL-SCZ : 27 December 2014), Thomas Henry Walters and Fanny Hysome, 24 Jun 1899; citing Durban, Natal, South Africa; 00470; National Archives and Records Service of South Africa, Pretoria; 1,259,229.
I wonder if the Hysome was originally Hisome?
Name Fanny Hisome
Event Type Christening
Event Date 25 Feb 1877
Event Place Graffham, Sussex, England
Father's Name William Hisome
Mother's Name Abigail Hisome
Citing this Record
"England, Sussex, Parish Registers, 1538-1910", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDX-7P4P : 9 August 2016), Fanny Hisome, 1877.