Thank you for your quick response Kathy. Yes, that does sound like him. I am a descendent of his eldest son Robert born 1842 in Mulgoa NSW. According to family legend, Andrew McKnight had some kind of connection to John Blaxland (of Blaxland, Wentworth and Lawson fame). Who knows if that's true or not but in any case, this is a big help and I now have a bit more information to investigate further. Much appreciated. Ikea

The Sydney Morning Herald Wed 21 June 1865
McKNIGHT—O'DONNELL— May 15th, at the Mulgoa Church,
by the Rev. Mr. Bailey, Robert McKnight, eldest son of the late
Andrew McKnight, of Mulgoa, near Penrith, to Emily, only
daughter of the late Thomas O'Donnell, of Liberty Plains, near Parramatta.
The Nepean Times. SATURDAY, OCTOBER 4, 1884.
DEATH of A VERY OLD RESIDENT.
ON Tueday last, at Luddenham, Mrs. Abigail McKnight,
one of the oldest and most respected residents of the
district, joined the great majority. Mrs. McKnight
had been ill for a considerable time, consequently
her death was not unexspected. The funeral took
place on Tuesday, and from 10 a. m. till noon there
was a string of the lady's friends from Greendale,
Luddendam, Cobbity. Camden, South Creek, and
Penrith constantly arriving. The funeral cortege,
numbering some hundreds, was upwards of half a
mile in length. The body was interred in the
St. Thomas Church Mulgoa, and was conveyed from
the hearse by relatives of the deceased to the grave.
The body was enclosed in a leaden coffin.

Nepean Times Saturday 8 August 1903
Robert McKnight. OBITUARY
At the residence of Mr R D Graham, in
Henry-street, Penrith, Robert McKnight,
late of Mulgoa, died of heart disease on
Sunday morning last. Robert was a
native of Mulgoa, and was the eldest son of
the well-known Andrew McKnight, who
came from Ireland to this colony, and was
one of the first, or nearly so, settlers in that
district—an energetic, pushing man who
made some mark in life and left many
traces of his thrift behind him. It was
Andrew McKnight who saw the need (at
that time) and started and run to advantage
for years the Victorian flour mills, combin-
ing with it many other businesses, and the
agricultural pursuits of farming — all works
of a progressive nature and a benefit to the
immediate neighborhood. The mill was
closed about 28 years since, and Andrew's
widow passed away some nineteen years
ago after a very useful career. Deceased,
being in his 61st year when death overtook
him, could also he considered an identity
and an old resident of Mulgoa, well known
and respected by all, of remarkably thrifty
habits, of a genial disposition and generally
admired as a man to be trusted.
An engineer by trade, he, for many years, filled
very responsible positions, both under the
late George Henry Cox of Winbourn, and
the late Mr Houston, of the tweed factory
at Regentville. In the year 1875 he
married, at Mulgoa, Miss O'Donnell (a
native of Parramatta), niece of Mr R D
Graham, now of Henry-street, Penrith.
Home ten years ago, Robert, having met
with an accident of some sort, Dr. Shand
was called in, and after minute examination,
pronounced the heart to be affected through
a serious hurt. Insufficient notice seems
to have been taken, however, of the doctor's
decision, and for years deceased periodically
suffered from this growing deadly disease,
until about five years ago it took firm hold
and incapacitated him from doing any kind
of hard work. For over four years out of
the five (his wife being in Penrith with her
uncle) he made his home principally with
his sister, Mrs McMinn, of Cobbitty, where
he was attended by several of the Camden
doctors ; the rest of the time was spent in
Penrith with his wife, he gradually becom-
ing worse, although at times he gave every
appearance of improvement, so that no
great anxiety was felt even a month ago,
when deceased suffered severely, as to his
early demise. Dr Higgins, who attended
him all through whilst in Penrith, gave him
constant and every possible attention ; but
sleepless days and nights told the dreadful
tale as all strength departed and wasting
rapidly set in, and the patient, after less
than a week of rest in bed, breathed his last,
perfectly conscious but in pain. The late
Robert McKnight leaves behind a wife and
eight children, four sons and four daughters,
all married except two, Ernest and Edith,
who reside with their mother in Penrith.
The married sons are Robert (near Mudgee),
Alexander (Menangle), and James (Castle-
reagh); the married daughters, Mrs Fryer
(Cobbitty), Mrs Megarrity (Wauchope), and
Mrs Stone (Sydney). He also leaves two
brothers — James, engineer, Sydney, and
Thomas, farmer, of Yass. The funeral took
place on Tuesday, the Rev H T Holliday, of
St. Stephen's, Penrith, holding service at
the house before starting. The remains
were conveyed by road to Mulgoa, and
interred in St. Thomas' Church of England
Cemetery, the Rev L Houston officiating at
the grave. Quite a number of Mulgoa
friends attended to pay their last tribute to
the dead, Mrs John Price and Son were
the undertakers.

Thank you Janilye. Much appreciated. Particularly the information on Emily McKnight (nee O'Donnell). The NSW Registry of Births, Deaths and Marriages could find no official records of her but we knew she existed - she was my mother's grandmother. Thanking you. Ikea.

a connection with BLW might be a connection with a Cox, one of the sons of William Cox, built the road after BLW

https://austcemindex.com/?family_name=McKnight&cemetery=1847