Hi kayteejohnstone,
SMH, 8 August 1949, has the death of Adelaide (known as Ada) JOHNSTONE's father, John Broadhurst NEWBOLD. In that death notice, Ada, is shown as Mrs. R. JOHNSTONE.
http://trove.nla.gov.au/ndp/del/article/27585678?searchTerm=... broadhurst newbold"&searchLimits=l-state=New+South+Wales
Did Gregory Ernest JOHNSTONE, (alias Roy SHIRLAW) become known as Roy JOHNSTONE?
Mary