Arthur was the youngest in the family until they adopted Alfred. He was in charge of the young boy since his brothers were all busy with their jobs.
Soon a new baby boy, Peter, was born into the family when Arthur was around 11 years old and became the caretaker for the baby but also for the 5 year old Alfred. He constantly had his hands full with the two, as well as getting teased by his older brothers.
((This may be one of the reason he likes books. They don’t make noise or beg for attentions LOL))