I'm not a descendant, but can provide you with some death details.
An Irene Gertrude Lackington died in 1981, aged 93.
A Francis Cripps Lackington died in 1995, aged 78.
Kathleen Anne Lackington died in 2005, aged 92.
John Frederick Lackington (you already have the year)in 1987, aged 76.
There are other entries for Lackington whose names you may be familiar with.
To find their burial/creamation details, Google 'Necropolis Deceased Search' (Springvale Botanical Cemetery).
Kind regards, Anne