I find it annoying when undertakers put their own name as the informant. When my folks died the funeral directors organised the death certificates, but put my father as the informant for my mother (as he supplied the information) & my sister for my father's death - as it should be.
The undertaker here, obviously got the information from someone & it would have been nice to know who!
The age certainly looks like 57, so if he did marry previously (as it may be from the Tas records) the "real" informant was not going to mention it (or did not know). Could have increased his age so he is not so much younger than his wife

It does seem to be the right person, so the mystery may simply be the name of Jane & her previous marriages, if any. Do let us know if you solve this mystery

Sorry that we didn't find any descendants
Trish