I've traced my fathers lineage as far back as Thomas and Mary (nee Riley). Their son, my great grandfather was Sidney Thomas, born approx 1866 in Staffordshire, d. 1907 in Wollongong NSW Aust. I believe Sidney came to Australia some time after 1879 - probably with his father Thomas.
Mary may have died prior to their voyage. If anyone has any info on Thomas (engineer)and Mary I would be very grateful.