Deaths of two brothers of Sir Michael O'Loghlen, 7th Bt. Their sister Janet's death is recorded on this group, but I do not find these:
Hugh O'Loghlen
Birth
29 May 1952
Death
25 Feb 2021 (aged 68)
Burial
Allambe Memorial Park
Nerang, City of Gold Coast, Queensland, Australia
Plot
Binnaburra Gardens, Heritage Garden Fountain, Site 38
https://www.findagrave.com/memorial/271345880/hugh-o'loghlenBryan O'Loghlen
1946 - 2017
Bryan O'Loghlen Obituary
"On 20 December 2017, aged 71 years, in Brisbane. Formerly of Lae (PNG), Melbourne and Apollo Bay. Second son of Sir Colman and Lady Margaret O'Loghlen. Survived by his sons, Ross and Craig. Loved brother of Margaret Bayles, Janet Gibson (deceased), Michael, Ross, Hugh, Colman and Brendan."
Published by The Age on Dec. 30, 2017.
https://tributes.theage.com.au/au/obituaries/theage-au/name/bryan-o-loghlen-obituary?id=43644601