Robert Cousland Elizabeth Mckay Died Victoria Australia

I do not know where Robert and Elizabeth were born or married. I am looking for any information
Cemetery records state that Robert was a Soldier. He was born C.1839, died 1921 Chelsea, Victoria, aged 82 years reg#13400

Elizabeth born C.1846, died 1933 Hawthorn, Victoria, aged 87 years reg#5134 Father listed as Alex McKay

The only child that I have found is;
Alexander McKay Cousland died in 1960 at Auburn, Victoria reg#7548 Parents Robert Cousland & Elizabeth McKay (born Abt 1882)

COUSLAND - On the 7th August, at the Homoeopathic Hospital, Annie Trench, the beloved wife of Alexander McKay Cousland, corner of Conderand Harcourt streets, Auburn, the loved mother of Robert, Barbara, Alexander, Betty, and Annie,aged 42 years.
COUSLAND.- The Friends of Mr. ALEXANDER McKAY COUSLAND are invited to follow the remains of his loved wife, Annie Trench, to the Burwood Cemetery.
The funeral will leave his residence, corner Conder and Harcourt streets Auburn, THIS DAY (Monday, 8th August), at 3.30 p.m
The Argus 8th August 1927 p.1