So it's looking as though this isn't the right family

It's very hard when (the right) John's birthplace was given as Glasgow, Scotland in 1901 and as Newcastle, Northumberland in 1891. And possibly as an unknown place in Durham in 1881 (if that's the same John as in 1891 and 1901).
JAP
PS: Just for completeness/interest.
Ann LOWRIE, b NORT, died aged 47 in 1873 in Victoria, parents James LUKE & Ann NICHOL. Right age for that Ann of the 1851 census.
There's the marriage of a James LUKE and Ann NICHOL in the IGI, 1820, Howick, Northumberland.
In Victoria, John LOWRIE, parents John LOWRIE & Ann LUKE, died aged 74 in 1928 (i.e. b ca 1854) in Pine Grove.
In Victoria, John LOWRIE & Ann LUKE had:
*Christina b Hamilton, 1859
*James Luke b Hamilton, 1861 (died age 15 in 1877)
*Andrew b Byam, 1863
*Edward b Bran, 1865 (died age 84 in Echuca in 1949)
*Walt b Branchholm, 1867 (died as Walter aged 71 in 1939 in Echuca; father's name given as John Scott Lowrie)
*Helen b Branxholme, 1869 (died as Ellen ZEALLEY aged 56 in 1926 in Eca)
*Thomas b Bran, 1871 (died aged 3 weeks)