About Sylvester Leopold Ralph
PJ Quirk says that Uncle Sylv was born in Renmark about 1890. He was younger that Grandpa Ralph. His full name was Sylvester Leopold Ralph. He married Nelle Jordan (maiden name Wade) on 27 Dec 1924.
However, information at www.whyalla.sa.gov.au/services/infrastructure control says his name is spelt Sylveston, and his wife is Nellie Therea - both buried at Whyalla Cemetery E-38-10. Note that this spelling might be wrong. The dates of death in this database are wrong - they are not generally the same as the burial date.
A photo of the gravestone says his name is spelt Sylvester, so can't trust that database. Also his wife is Helen Theresa (Auntie Nell). I have updated names and dates of death using the gravestone.