I hsve no idea which valley you live in Sparkly but I do know girls were more disadvantaged than boys come the 11+ , it was assumed girls would marry so not be bread winners, boys got into grammer schools with lower pass marks than girls, perhaps your neighbour had learning difficulties? My g grandfather was a Bsptist Minister and I inherited his journals, , his four children, one my grandmother, certaintly could write, I have poetry she wrote and her two brothers One was a solicitor , his son born just before the depression was head of the grammer school , and if you google Sir Horace Evans another family member who was born in Dowlais you will find he certaintly was well educated , he was a first cousin to my grandmother . Learning difficulties were not recognised in the forties, these children were just dismissed as not bright.