Hello again ,
Here are some siblings { of course would have to be verified}
5251/1878 GRIFFITHS JOSEPH JOHN REBECCA PADDINGTON
7013/1881 GRIFFITHS EMMA JOHN REBECCA PADDINGTON
17622/1884 GRIFFITHS WILLIAM S JOHN REBECCA RYDE
4810/1885 GRIFFITHS ELSIE M JOHN REBECCA BALMAIN
Rebecca's death :
908/1938 GRIFFITHS REBECCA ALEXANDER REBECCA DRUMMOYNE
The Field of Mars cemetery is usually searchable online but I can't get it to work today
http://www.catholiccemeteries.org.au/If we could find Rebecca's burial she may be buried with John which would help us narrow down the entries for his death .
John and Rebecca's Marriage certificate should list both parents of bride and groom.
233/1936 GRIFFITHS JOHN ALBERT JOHN REBECCA SYDNEY
Charles' death :
36655/1966 GRIFFITHS CHARLES RUSSELL JOHN REBECCA BURWOOD
5601/1967 GRIFFITHS JOHN ALBERT JOHN ALBERT LOUISA ANN SYDNEY
Regards
Alison