Here are a couple of little things which may help you along in your search.

This family lived at Vinegar Hill, Evandale, Tasmania. According to Electoral Rolls Joseph was a ploughman; and Yes Coralie was registered as living with them in 1914 (voting age 21) and in 1919 Mervyn Harold (shearer) appear to be living with them. The last time I see Margaret Maroney on the roll is 1922, This would mean she either died or moved. Possibly died, I don't see her moving without her husband, but then-?
Joseph and son Mervyn appear together, still living at Vinegar Hill in 1928.

Joseph MARONEY died in Melbourne 23 May 1938 ( below is his death notice).
Examiner (Launceston, Tas). Wednesday 25 May 1938
DEATHS MARONEY.-On the 23rd May, in Melbourne, Joseph Maroney, late of Evandale, Tasmania.

Australian Electoral Rolls, 1903-1980
about Joseph Maroney Name: Joseph Maroney
Gender: Male
Electoral Year: 1914
State: Tasmania
District: Wilmot
Subdistrict: Evandale

Joseph Maroney did marry Margaret Walsh in Tasmania on 21 July 1877

Australia Marriage Index, 1788-1950
Name: Joseph Maroney
Spouse Name: Margaret Walsh
Marriage Date: 21 Jul 1877
Marriage Place: Tasmania
Registration Place: Launceston, Tasmania
Registration Year: 1877
Registration number: 593

Whilst looking for a death for Margaret and Joseph I came across a couple of other things which may or may not relate;

Australia Marriage Index, 1788-1950 this registration may not relate, since tonkin found the other which appears to be correct. j

Name: Gladys May Maroney
Spouse Name: Norman Richard Bransiden
Marriage Place: Tasmania
Registration Place: Tasmania
Registration Year: 1916
Page Number: 0181

Australia Marriage Index, 1788-1950
Maroney Name: Mervyn Maroney
Spouse Name: Olive Cutler An Olive Alice Maroney appears on the 1928 roll living at Beltana, Evandale only one Mervyn on this roll. j
Marriage Place: Tasmania
Registration Place: Tasmania
Registration Year: 1917
Page Number: 0741

Appearing as Mervyn Harold on electoral Roll;
Australia Birth Index, 1788-1922
about Harold Mervyn Maroney Name: Harold Mervyn Maroney
Birth Date: 12 Apr 1889
Father's Name: Joseph Maroney
Mother's Name: Margaret Welsh
Birth Place: Tasmania
Registration Year: 1889
Registration Place: Evandale, Tasmania
Registration number: 1391

Here is the death of Gladys May Bransiden, nee Maroney;
Australia Death Index, 1787-1985
about Gladys May Bransden Name: Gladys May Bransden
Death Place: Victoria
Age: 82
Father's Name: Joseph Maroney
Mother's Name: Margaret Walsh
Registration Year: 1973
Registration Place: Victoria
Registration number: 30622
Estimated Birth Year: abt 1891

Mervyn Harold Maroney and Olive Alice Maroney were my great grandparents whom I never got to meet. Their children were Kenneth, Eric, Joan, Margaret, Kathleen and Ella. I never met Ken who married Valmay, I am unsure of their children's names. Eric married Amy (the most delightful great aunt a girl could wish for) and they had Philip who sadly died a few years ago, Philips children are Tara and Kris. Joan married Jack Squires and had Susan and Gregory, Joan is still alive today living independently, she would be in her 90's. Margaret who everyone called Meg was married and had Brian, she then re married Kenny Keogh who was a lovely man and they both passed a few years ago in a very short period. Brian Hawkins married Lorraine and had Katrina, Christine and Dale. Kathleen my nan preferred Kath or Kathy and she married Geoffrey Barker and had Karen (my mother) and Gary (dec). Karen married Vern Watson & had Kelly, Narelle (me) and Anna. Gary had a daughter Jacqueline before he died. Ella married Reg and had David (dec) and Joanne.