While looking for deaths / marriages for George & Harriet I spotted this death - which has no matching birth registration.
Charles JONES died 1854, aged 6 weeks, father Charles, mother Elizabeth
Birthplace shown as Moorabbin, where Francis & Sophia were registered.
I'm sorry, the names are just too common to pick any marriages for them, and I cannot find deaths either, so they have probably popped over the border into NSW (which you can search yourself free online)
ChristineR