As for Sarah and the kids...
Oliver ended up in England for the 1901 census, but in Australia there was some big changes happening. This was the time of Federation i.e. Australia became a nation in 1901 and it seems almost all databases pick that point to finish one index and start another.
As you will find in that link I posted above, the wonderful rc volunteers have searched the pre-fed index, but I don't think we've been able to rule out the Sarah and the kids going back to Tasmania post-fed. (although I may have read it wrong).
Gee I hope Lily ended up in England though. I'd really like to write to her living descendants.
This isn't a very informative post, but I tend to think 'out loud' even if that means using my fingertips. Tristi