hi there are a number of articles on TROVE regarding John and his kilts, also another obit which lists his children, so suggest a search on Trove using Fletcher and Kilts, if you have not already checked.
this is the other obit listing children
https://trove.nla.gov.au/newspaper/article/195799607regards Cass
also have you seen the tree on ancestry which records
John Fletcher
Birth 9 OCT 1809 • Aberdeen, Aberdeenshire, Scotland
Death 1893 • Braidwood, New South Wales, Australia and his wife Mary Fletcher died 18.2.1900 Rhynne Aberdeen
also list his parents as
James FLETCHER
Birth 01 OCT 1773 • Sheffd, Yorkshire, England Death 12 AUG 1856 • Parks, Scotland
and
Elizabeth GREY
Birth 24 JUN 1780 • Aberdeenshire, Scotland or Belford, Ireland
Death 15 DEC 1856 • Glenmuick, Aberdeenshire, Scotland