A Frederick Hugh Mackay was born in Launceston Tas 5tb May 1835. His parents were Hugh Rose Mackay and Martha Kinnleside Kirton. He died in Kew Victoria in 1883 reg 2057. His death registration names his parents again as Martha Kerton and Hugh Rose Mackay. His wife is Annie Hislop and he was 46 years old.
Death notice in the Launceston Examiner 13th March 1883: On 1st March at Kew, Victoria, husband of Annie aged 46.
Frederick Hugh Mackay was 1 of at least 6 children all born Tasmania. He had a sister Laura Eliza as well, born 17th April 1839 in Launceston,Tasmania
His father Hugh and brother Stewart appear to have been successful businessmen, and the whole family, kids and all, travelled extensively.
The father Hugh Rose Mackay died in Victoria 1890, in his 80's.
Need to follow up what children Frederick Hugh Mackay and Annie Hislop had, but I'm thinking the person who married John Cameron could be their daughter