.......I have details on all except Grandville and Amy maybe they went to Victoria. Minnie I have no idea at all
Not sure if this would be your chap, but 1922 Electoral Roll, Granville Modo Williams was a farmer at Burnie, Tas... quite a few with surname Williams on that part of the roll ... (Darwin, with polling place of Emu Bay)...
some "Williams" females with Burnie as address : (
adding, from same 1922 roll)
Alice, home duties;
Beatrice (Jones St - only one with street address noted) home duties;
Daisy Mildred, home duties;
Eileen Charlotte, home duties;
Kathleen Elda, home duties;
Ruby Ethel Oakleigh, saleswoman;
.... from that 1922 roll, there's no way of knowing if any of these lasses were the wife/mother/daughter/cousin/aunt etc of Granville Modo Williams... And of course there's no way of knowing if that Granville Modo was your Grandville Modds but hope this helps if only to eliminate possible marriages/children...
Looking for marriages, children and deaths of Grandville Modds Williams b.1891 ll b. Deloraine Tas.
If this was your chap, then he was in Tas in 1922

Cheers, JM