Yes I've just gone and had a look at that and there are children under NSW births deaths and marriages from 1838 - 1844; between BDM and Ancestry I found:
John Clugston b. 1838, Sydney
John Clugston b. 1839, Sydney
James Clugston b. 1839, Sydney
James Clugston b. 1840, Sydney
William Clugston b. 1842, Sydney
Henrietta Clugston b. 1844, Sydney
I can't search VIC BDM directly but on Ancestry Birth & Death indexes I found the following all with parents Alexander & Henrietta:
Margaret Clugston b. 1848, Edwa. (?) Victoria
Robert Clugston b. 1850, Edwa. Victoria
Alexander Clugstone b. 1854, Campbells Creek, Victoria
Mary Ann Clugston b. 1857, Castlemaine, Vic
Jessey Clugston b. 1860, Amehurst, Vic
Along with a death for Henrietta (1860 - VIC) and Alexander Clugston is on the Electoral Rolls at Maldon in 1856.
So they started in Sydney and then came to the VIC goldfields ... and stayed here .... maybe.
My head hurts.
Thanks,
B.