Possible? https://www.familysearch.org/ark:/61903/1:1:QPLW-WV13 Probate Date: 3 Jan 1890; Event Place:Middlesex, England, United Kingdom Death Date:29 Nov 1889 Beneficiary's Name:John Stone (father?)
Must access and read England and Wales, National Index of Wills and Administrations, 1858-1957, Digital Folder Number 007704593 Image Number 00501
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.
He lived in Old Street Road, Shoreditch, Middlesex, England from 1861.2
Occupancy/Contact Notes
Household Role Sex Age Birthplace John Stone Head Male 50 Rebecca Stone Wife Female 45 St Lukes, ... Rebecca Stone Daughter Female 16 Bayton, Surrey John Stone Son Male 14 Bayton, Surrey Henry Stone Son Male 12 Bayton, Surrey Edward Stone Son Male 6
He lived in Shoreditch, Middlesex, England from 1871.3
Occupancy/Contact Notes
Household Role Sex Age Birthplace John Stone Head Male 62 Shoreditch, Middlesex Rebecca Stone Wife Female 55 Shoreditch, Middlesex Rebecca Stone Daughter Female 26 Croyden, Surrey John Stone Son Male 24 Croyden, Surrey Henry Stone Son Male 22 Croyden, Surrey Edward Stone Son Male 16 Sydney, New South Wales
Household Role Sex Age Birthplace Rebecca Stone Wife Head Female 68 London, Middlesex, England Rebecca M Stone Daughter Female 35 Norwood, Surrey, England Thomas E Stone Son Male 26 Australia Address given as Winston Rd, Stoke Newington, London,Middlesex, England.