Question

Why does persome call her brother a "child"

Answer 1

Persome calls her brother a child because the moment he is not with her , he goes and help others without worrying about his own needs . This is the typical behaviour of a child ( the behaviour is - the moment they are free , they do something troblesome ) and thats why persome calls her brother a child.

Answer 2

Persome feels her brother is simple and innocent. He bears no ill against anyone. He is always ready to help others and is sincere in his efforts. He gave away his precious possessions for the sake of poor. His childlike behaviour make him neglect himself and he needs to be looked after a child.