Hi Dorothy
Season's greetings!
Not sure what information you have about the Ifflands, but I'm happy for you to look at my Ancestry.com.au page and see if it adds to whatever information you have. I'd just need your email address to send you an invitation to access my page, if that's not a problem.
Others here in Australia have probably conducted a lot more research on this particular family than I have, but I've happily borrowed from Ancestry whatever they've done and updated my page. It must be about 15 years ago that we had a largish gathering here in Sydney of Iffland descendants and related German families from that 1850s migration program.
The NZ connection is interesting. I'd be interested to know why and when Maria went there. I haven't added her to my tree, yet. If you'd like to provide some information about her on my page, please go ahead. I think you can do it under the "Comment" function.
Regards,
Mal Jones