Abergele Grammar school early 1900's

[cnerys]

I have recently been told that a brother to my ggrandfather worked at Abergele Grammar school as a Woodwork teacher. As far as I know my Ggrandfather Edward Williams b 1885 Abergele had only one brother David Williams b 1880 Abergele. But he died in 1915 during WW1 in France. Is there any way I can find out if it was David Williams who worked at the Grammar school or might I have found another sibling to Edward? Carpentry was one of the main jobs for my Williams.
Kind regards
Nerys