In the 1911 census he was living with his family at 1 Bell Cottages, Penmaenmawr then nothing until he marries my grandmother in Liverpool in 1921.
Seen the 1911 census now and his CWGC entry. Both stating his father to be Robert Williams and mother to be Ellen Williams.
Curiously the North Wales Chronicle dated 15 11 1918 has, under Penmaenmawr
" The death also took place on Monday of Mrs Ellen Willams. Castle Hall, widow of the late Mr Thomas Williams, 1, Bell Cottages."
Absent Voters for Penmaenmawr has a Thomas John Williams, Castle Hall as Pte 32107 in 19th Bn, Welsh Regiment.
Does this Castle Hall or the deaths of his parents feature in your research?