Mrs Isabel Geraldine Mackay was born in Launceston on 26 May 1867, the fourth of eight children born to Edward Going Pennefather and his wife Frances Harrison. Isabel Pennefather married widower Stuart Mackay in Launceston on 24 Jan 1887. Their daughter Irene Frances was born the following year on 14 Jul. Isabel's mother died at her daughter's residence at Invermay on 28 Aug 1889. It appears that Isabel left Stuart. By 1903 she was living at 88 Ebley Street, Waverley, NSW. When Stuart died in 1908 there was no mention of his wife or daughter. Stuart is also pictured in the Family Album, as are Isabel's brother George and sister Alice Pennefather.