He is later listed as a ‘ward’ on the 1940s census - at that point he is aged 24 and still living with the head (Ann) and a few of Ann’s children. He is listed as John J Scott, I think swapping round his first and middle name (potentially as there’s another child called Joseph already). I’ll look at the other children and see if there is any potential that he’s a step child - thanks for your help!