Hi there,
Andrew and Eleanor MURRAY (nee Kilpact/k) married 13 July 1818 at St Johns, Ptta and the couple had at least two children in NSW :
Christina S, baptised in 1820 (Volume 1B, line 5289)
Elizabeth S, baptised in 1827 (Vol 1C, line 7885 and Vol 150, line
***I have also noticed that a David MURRAY married Elizabeth Ann MILSON 10 Oct 1827 in NSW. ....
Merlin has already found (reply #4) that Andrew’s sister in law Elizabeth KILPACK married a James Milson(Snr) ...
I am not sure if that David Murray or that Elizabeth Ann Milson are connected to either Andrew Murray or his wife Eleanor, or Eleanor's older sister Elizabeth who married James Milson.
Cheers, JM
Edit to add,
*** Elizabeth Sophia MURRY (sic) baptised 1 April 1827 dau of Andrew Murry (sic) and Eleanor (from extracted IGI), and adding, Elizabeth Sophia Murray younger daughter of Andrew Murray Esq married Neil Stewart

at Bathurst, Scots Kirk.