https://www.records.nsw.gov.au/archives/collections-and-research/guides-and-indexes/node/1316/browse shows: John Thomas STONE 7 yrs Randwick Asylum for Destitute Children discharge 27/01/1860 Edward STONE 6 yrs Randwick Asylum for Destitute Children discharge 27/01/1860 The ages correspond with those of Sidney and Thomas Edward. Thomas Edward was known as Edward (UK census records). Sidney may well have used his elder brothers name of John Thomas (who himself may have gone by the name of Thomas, since his dad was John). Confusing yet plausible.