This document discusses the nature versus nurture debate and how it relates to Russell's depiction of the brothers in My Child and My Friend. It notes that Eddie was nurtured into a well-spoken, middle-class boy while his twin Mickey remained a working-class ruffian. However, when Eddie returns to the Johnstone household we see a change that suggests he is going back to his roots. It also suggests that fate and heredity are working together to bring the brothers back together.