I see a John Witter, father Richard, who died in the Chatswood area in 1947 ... reg # 7798/1947. Also, Robina Witter, father Peter, mother Alice, died in the St Leonards area, 1968 ... reg # 11434/1968
There's also a death of a Cecil Henry, father Jack, mother Susanna Delina (sic), Parramatta district, 1954 ... reg # 20792/1954
Of course, it still might end up being totally the wrong family
