Mary and her best friend (Jane) worked at a minimart on weekends and two weekdays (after school hours). Both of them are 11 years old. There was no minimum legal working age in their country, AATT Kingdom. However, schooling was legally compulsory until the age of 12. Mary and Jane attended school but were indeed falling behind in their studies. James is Mary's classmate and worked at the minimart on Saturdays only. The minimart belonged to Mary's father. Her mother has passed away a couple of years ago. Mary was the only child and her father would always tell her that her future is in the minimart.

(a) Appraise if Mary, Jane and James 'work' is classified as child labour. Formulate the answer and explain the basis of classification.