There is a death Ancestry England & Wales, Death Index: 1916-2006 for a Roa Maria Veillard in 1971 (her first name is spelt incorrectly ROA instead of Rosa) in Glamorganshire - her husband Octave died 1975 South Glamorgan
Rosa Maria WALLER birth reg: Qrt Jun 1889 District: Norwich Vol: 4b Page: 160
1901 Census District: Norwich County: Norfolk
John M WALLER Head age: 41 b: Norfolk E Rucham Occ: Mill Band Maker Maria WALLER wife age: 37 b: Norfolk Harpley Edward J WALLER son age: 16 b: Norwich Rosa M WALLER daug age: 15 b: Norwich (think age wrong 12 could be transcribed as 15) Daisy M WALLER daug age: 10 b: Norwich Robert WALLER son age: 9 b: Norwich Sidney WALLER son age: 4 b: Norwich
There is a Robert WALLER died Wollongong NSW his parent match.
23299/1952WALLERROBERTFather: JOHN Mother: MARIADistrict: WOLLONGONG
Also on Australian National Archives you can view his WW2 Records had a wife Ethel WALLER his date of Birth is 29/11/1891 Norwich.
There is also a son WW2 Records Robert John Victor WALLER b: 9/07/1923 Auburn NSW.He died 1999 Wollongong see Ryerson Index - index death notice under Robert John WALLER.
Checked FreeBMD for marriage of a John M WALLER and a Maria.
John Mitchley WALLER married Maria BEAVOR Qrt Dec 1883 District: Freebridge Lyn Vol: 4b Page: 929
Believe this is Rosa's brother FreeBMD Robert WALLER birth reg: Qrt Mar 1892 District: Norwich Vol: 4b Page:
If you check FreeBMD you will find other siblings birth registrations.