Hi robandrob2
First of all, I'd suggest you ask a moderator to move this to the Australia board.
Was he married to Ann Dyke in Tasmania or elsewhere? Where were the children born?
Many convicts from Tasmania 'migrated' to the mainland when they were able, mostly to Victoria.
Have you looked there for his death?
If you can give names and dates for the children, people may be able to find them more easily.
Dawn M