Hi Reece Rels,
I just googled Johann Karthegene and up your chat came. Poor old John Halligan (Johann Karthegene) died in the Parramatta Asylum, having become insane from the last stages of the unmentionable disease.
The record is available on request from the NSW state archives office. There is quite a good description of him in the records. I don't think his wife knew where he was or that he had died.
I was having trouble finding the birth records of the six children except Rose and George but I read that someone had found all the certificates. Were they registered under a different last name spelling?
Latimore has at least six variations. I'm not convinced Karthegene is the real name as both Johann and Mary Jane were illiterate and we can only rely on the hearing of the Officiating Minister. The other mystery on the wedding certificate is Patrick Costello's claim to be the stepfather of Mary Jane, but so far I have found no record of his marriage to Eliza Latimore.