Looking for Any Smith Family and Clark Family

hello hoping someone can help me .
I am looking for any children of Sybil & George Clark from Queensland

George died 1966 wife was Sybil Maud Clark nee smith she died October 1992/3 both buried in hemmant cemetery
I am seeking information on any child /children born to that union .Sybil was my mothers eldest sister who left the Tumut district when she was 17yrs, first marring an Archibald smith then later a George Clark. his place of birth states that he was born in Melbourne Victoria , Sybil came from the Tumut nsw area. mothers name was Mary