James Connor Married Mary Bennett 20 Jan 1865 Redruth Burra South Australia Got from Marriage Certificate

That is all the information I have on James and Mary (I am doing research for my daughter in law Vanessa).
Thomas Connor son, b abt 1873 (2nd Great Grandfather) d 1924 Williamstown, Vic, Australia married Annie Maria Page 1896 Williamstown, Vic, Australia. On their marriage certificate it states father James Connor labourer mother Mary Bennett and it also states that Thomas was born in Jindera, NSW. Apart from James and Mary Bennett's marriage certificate which just stated they were married in Burra SA and Thomas & Annie's marriage certificate that is all I have got to start the journey of them. I cannot find Thomas's birth record, did he have siblings and can only guess that they went from SA, to NSW, to Victoria Australia. Would really love some help with this as two people migrated to Australia and I do not have information as to where they come from.............Cheers Marilyn