I have found this information on Thomas Whittle. It may add to the theory that at least one child of Anne Young is the child of Thomas Whittle. I would have been at the government stockyard at the same time as Ann.
WHITTLE, Thomas (Thomas WHITTLE)
Soldier, "drum-major" (sergeant-major), New South Wales Corps
Born Dublin, Ireland, c. 1764
Arrived Sydney, NSW, 7 October 1792 (per Royal Admiral, from England)
Departed Sydney, NSW, Sydney, NSW, 12 May 1810 (per Dromedary and Hindostan, for England)
Discharged England, 25 August 1811
https://sydney.edu.au/paradisec/australharmony/register-W-2.php#WHITTLE-Thomas (shareable link to this entry)