Naomi died in 1929 - address from the probate register was 6 Margaret St, Gilfach Fargoed
According to electoral registers Taliesin and brother Samuel John are at that address together until 1938
Samuel John is alone in 1939
Sadly, this might be the reason
Taliesin Rees
Death Age 52
Q3 1939
East Glamorgan Vol 11a, p862