Mrs Johnstone: '"And when he grew up / He could never be told / To stand and queue up / For hours on end at the dole / He'd grow up to be / A credit to me"'
Mrs Lyons: '"You learn filth from them and behave like this like a, like a horrible little boy, like them. But you are not like them. You are my son, mine, and you won't, you won't ever…"'
"So, did y' hear the story of the Johnstone twins? As like each other as two new pins, Of one womb born, on the self same day, How one was kept and one given away?"
The relative significance of a person's inborn individuality, which is considered as "nature" versus individual experiences, which is "nurture", in shaping or causing differences in physical and behavioural character.