Ellen Mary CAPPER in South Australia 1880

I am searching for a Capper family that lived in Adelaide, South Australia.Ellen Mary Capper married my great grandfather Walter Barritt on 28 Jan 1880.They lived at "Highlands" Lyndoch in the Barossa Valley. Mary Ellen died 19 Nov 1917 and is buried in the Old Lyndoch cemetery.The only information I have regarding the family is that her father was an Adelaide Quaker businessman, she had a sister Bessie (who never married) and there was a niece by the name of Kathleen Johnson, who visited "Highlands" from Adelaide where she taught dancing.Any information re this family would be much appreciated.

Ruth