Have been sitting here for a while tonight trying to figure this all out- no new real information but a few comments/ideas.
1) obituary for Robert Hunt's father does not mention him or brother George- the obituary is typical for its time and lists the chief mourners so it looks like neither of them were at the funeral. Is there a year for W.L. Hunt's death?
2) 1911 census shows Robert W. Hunt as retired military officer- is it possible he also served in WWI- and if so, could this be connected to the dispersal of the family.
3) think it would be worth getting the death certificate for Robert Hunt 1921- will give place of death and usual residence (if not place of death), marital status, occupation and informant.