Growing up I had a uncle who could not read or write.
That must have been challenging for him. Was it something that y'all all knew, or was it a well-known "secret"?
The concept of literacy is expanding in OECD countries today. But it was well known he was like that
What is OECD? And did he ever learn to read and write?
The key to literacy is reading development and OECD is the term for learning adults I think.