Hi jud,
Thanyou for taking an interest in all of this. greatly appreciated.. I have the crtificate in question. I will find it later and transcribe for you,although I believe we have covered all bases.But another perspective may help.

I believe if you look on ancestry.com.au, i typed in simply just MADDRAH and came up with benjamin. if you look under marriages etc it has benjamin maddrah death 1853.
In 1850 it has a marriage for Benjamin to Matilda. SO I assume he remarried, same/approximate DOB.
As for a divorce from Isaac.No, i cant find one. i do have that his death was 1919. On BDM it only has 1919 and fathers name Isaac which matches, no mother identified on BDM.Thus if he died this late, then I dont understand why there is no divorce record.hmmmm
No, nowhere can I find a birth or shipping record for ellen or annie....WAs Annie born at the female factory As someone mentioned earlier?? Shouldn't there be a record though?