Hi dracon1a,
The female children born in Tas to William and Margaret were both not named at the time of registration - just "female" and this was fairly common. All pre 1899 Tasmanian events are on microfilm and there is a link here which lists the libraries which hold the microfilm. It is far easier (and cheaper!) to look at the entries yourself.
http://portal.archives.tas.gov.au/menu.aspx?search=8Does Ada's marriage cert have a
place of birth? Did Margaret die in Victoria? If so, her death cert should name all of her children, including those from previous marriages, both living and deceased.
Sometimes when people can't find exactly what they are looking for they make up scenarios (she must have been born on the boat, and they aren't her real parents because there is no birth registration) but the fact is that many births were not registered at all, and as I have said, many were registered as male or female only.
Debra
