There is a marriage on ScotlandsPeople for a Thomas WELSH and Isabella ROLLEY in 1893. I do not have any credits to look at the record.
The entry for their son William is not William B but William F
I find it strange that Thomas would give the enumerator information to be so inaccurate.
Cando
Death
WELSH William Bruce
Father Thomas
Mother Isabella ROLLO
Death Place MELB
Age 64
Year 1959
Reg Number 4146
This announcement has been given by Ros (somewhere

)
WELSH-D'ARCY. - On the 24th June, at All Saints' Church, East St. Kilda, by Rev. Jones, William Bruce, eldest son of Mrs T. Welsh of Ayr, Scotland, to Adelaide Frances, eldest daughter of late Tom D'Arcy and Mrs D'Arcy, Commercial road, South Yarra. (Interstate papers please copy)
Electoral Roll 1931
Address- 15 Toolangi Rd Alphington (
EDIT to add suburb accidentally omitted)
WELSH, William
James B Sales
WELSH Adelaide Frances HD
They do not appear together on the rolls after this.
William becomes hard to track as the occupations for men of the name (who may or may not be him) are inconsistent ranging from mechanic to nil and at various addresses.
Death
WELSH Adelaide Frances
Father Darcy Thomas
Mother Marianne Maude PERRY
Death Place CHEL
Age 66
Year 1959
Reg Number 14488
The letter in his file dated 1936 (or 38) seems to say he is planning to leave for Europe. Wonder why it was important to establish a birthplace of India right there and then.
The letter is written in an educated hand and the wording is also well managed.
The second given name BRUCE only appears in the letter, not on the attestation documents.
Sue