Hi Elise,
12 November 1954, Sydney Morning Herald, has the death of Pearl's mother.
http://trove.nla.gov.au/ndp/del/article/18462144?searchTerm=... ann reilly"&searchLimits=l-state=New+South+Wales
REILLY, Sarah Ann. -November 11, 1954, at hospital, late of 20 Tupia Street, Botany, dearly loved mother of William, Alice (Mrs Evans), Bertha (Mrs Cooper), Alexander and Pearl and grandmother of Bill and Jack aged 90 years.
REILLY. - The Relatives and Friends of the late SARAH ANN REILLY, of Botany, are invited to attend her Funeral; to leave Metropolitan Funeral Home, corner of Prince’s Highway and Bestie Street, Rockdale This Day (Friday), at 11 a m for the Eastern Suburbs Crematorium.
30299/1954 REILLY SARAH ANN JOSHUA ELIZABETH ROCKDALE
Eastern Suburbs Crematorium, website...
http://www.esmp.net.au/search-map-facilityMary
ADDED.
Death of Pearl's sister-in-law, Kathleen Elizabeth REILLY, wife of William Henry REILLY, published 25 June 1954.
http://trove.nla.gov.au/ndp/del/article/18441781?searchTerm=... tupia street"&searchLimits=l-state=New+South+Wales