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I’ve spent a few hours researching this man.
If you do an Internet search of his names, you will find others who have completed the tree.
His mother and sister Emily died in QLD. His brother John predeceased him.
John: Write-up includes photo and names of wife and children:
http://nla.gov.au/nla.news-article27028323Married Scotland: HASLOPE JOHN MELVILL to WRIGHT JEANIE BENNETT 1943 651/ 228 Airdrie or New Monkland
Wife remarried VIC: 9677/1953 CHAMBERS, Jno Easton to Jeanie Bennett W
CHAMBERS Jeanie Bennett Walker Death notice 31AUG2005 Death 82 at St. John of God Hospital, Geelong Herald Sun (Melbourne) 03SEP2005
Possibly the son mentioned: HASLOPE Iain Melvill Death notice 26JUL2014 Death 69 Canberra Times 02AUG2014
Annie Elizabeth Haslope
Event date: 26/06/1972
Event type: Death registration
Registration details: 1972/C/3353
Mother: -
Father/parent: Alfred Budden
https://www.findagrave.com/memorial/180202393/annie-elizabeth-haslopeELKINGTON Emily Mary (Mary) Funeral notice 18AUG2012 Death 92 late of Warwick, formerly of Toowoomba The Chronicle (Toowoomba) 21AUG2012.
Lancelot C was not married and no children mentioned. However, his military file indicates he may have fathered a child in England, during his service. His mother is mentioned in probate notice and she is next of kin in his military record.
John was married with 2 children.
Emily had 4 children, 3 of which were still living at time of her death.
Son’s death:
John Simeon Haslope Elkington
Event date: 10/08/1986
Event type: Death registration
Date of birth: 1944
Registration details: 1986/6199
Mother: Emily Mary Haslope
Father/parent: John Simeon Elkington
NAA records:
Lancelot M:
https://recordsearch.naa.gov.au/SearchNRetrieve/Interface/ViewImage.aspx?B=9770715John M:
https://recordsearch.naa.gov.au/SearchNRetrieve/Interface/ViewImage.aspx?B=5246458Lancelot C:
https://recordsearch.naa.gov.au/SearchNRetrieve/Interface/ViewImage.aspx?B=30697578Jamjar