I believe they were all born in Tasmania as Walter was a farmer at Beulah. I thought for a while that maybe Olive and Ruby Olive were one and the same but have been told that they are not. Unfortunately I am going on other people's information as this is my father's mother's family and I was raised by my mother in Victoria and never knew any of them. I DNA match this Moore family and have found all but one of the other siblings birth notices. She was Ruby Olive Moore per the Tasmanian Federation Index results records for her marriage to Albert Edwards and the birth of her son in 1918. I have also seen a public trustee document where she is noted as Ruby Olive Edwards (dec) in 1960.
Thanks for your interest rocksolid