Shipping record - I know you probably have this but thought it worth transcribing. It would seem there were many passengers on this ship joining convict parents. The only 'new' piece of info is a different spelling for Patrick's wife's parents.
Success arrived Sydney 17 Dec 1849
HALIAN Patrick, 36 Labourer, can read
Native Place: Kill West Meath,
Parents: Thomas and Mary, both died (this has been crossed out) and 'Father living in Sydney' written in. Father Thomas Halian per ship Cambridge, tried at Phillipstown, living
Bodily health, strength and possible usefulness: good
Wife: Bridget, 34, farm servant, native place Kill, West Meath, parents James and Bridget Caton? (both dead) RC, cannot read or write, no relations in colony.
Children : James 12, Bridget 11, Mary 6, Catherine 4, Thomas 1
HALION Honora 26, Mary 24, Bridget 25, all from Kill, none can read or write, all with parents Thomas and Mary - father living at Goulburn Plains, Thomas Halion per ship 'Cambridge', tried at Mullingar, Honora and Bridget listed as good health etc, Mary listed as 'clubfooted'
HALION Thomas, all details the same except can read, also states under "Complaints" - 'sister with complaints that she did not get porper attention or the requisite allowance of medical comforts' Doesn't say which sister!
Looking at Victorian BMDs 1836-1891 the only HELION I see is this marriage:
Marianne HELION = Joseph DE GILLE 1857 reg 4083
Tried Helian, Haylan, Haylen, Haylin, Halion, Helin, Healin
Judith