Also, his brother in law, my great uncle, was a self-taught multi instrumentalist.
Uncle had a spotty pre ww2 work history in menial factory jobs and such.
He also had a reputation as a bit of a work shy layabout.
That I again guess would give spare time for self education and free thinking,
until being shoved into essential war factory work..

Sometime along the way he learnt to read music for playing in pub sing songs...

Which is how I remember him from the 1960s...

Working class self education movement and public libraries
matterd significantly in the early 20th century...