Thanks so much for all the information, some of which I had, and some of which I didn't.
I had noticed incidents of Charlottes first & second names being reversed, and changes in spelling of Shafer and Schafer.....makes searching so much more difficult. On the naturalisation certificates the name is Hoffmann, but the signatures are Hofmann.
Hofmanns married into the Forster family here in Tasmania, and a (Forster) relative has travelled to Zwickau in Saxony to research both Forster & Hofmann families, but found very little information, thus concluding that Hofmanns had spent little time in Zwickau, and were probably from somewhere else in Germany originally.
Also have the place name Zwikien Saxony on one of the naturalisation certificates, but can't locate Zwikien on a German map.
The other Children: Richard died early. Max never married. Charles married & had a daughter Vera Belle Hofmann. He died in a quarry accident. Alma married Thomas William Harris, my grandfather. Agnes (Maria) married into the Eiszele family. The rest I'm still looking for. I have copies of naturalisation certificates for all the boys, but not the girls.