McCarthy and her four brothers were also sick and kept in a small recovery room in her Grandparent's home. They were told their parents were at the hospital recovering, but Mary eventually realized their true fate. McCarthy and her three brothers were kept at her lavish grandparent's home until they were well. Then began the most horrible period in young Mary's life; her grandparent's hired Uncle Myers and Aunt Margaret (Margaret was her grandmother's sister and Myers was her new husband) to be their guardians. This was done so the children would not be split up, but on many occasions Mary and her eldest brother deeply wished they could be placed in an orphanage. Her guardians had a generous allowance from her grandparents yet the children were kept half starved, in old tattered and patched clothing, routinely punished with severe beatings, and forced by their aunt to undergo rigorous treatments of the latest health fads. Of these the most memorable was having their mouths taped shut each night to prevent "mouth breathing". Mary and her brothers were eventually liberated from these treacherous conditions by her mother's father, Grandpa Preston. However, upon this liberation Mary and her brothers were separated; she went back to Seattle with her mother's family and her brothers remained in the Minneapolis area with different members of the McCarthy family. .
Mary was exposed to many types of parenting and authority in her adolescent years. She was either in parochial schools, or religious boarding schools, until highschool when her grandparents permitted her to attend a public high school for her freshman year. After a year full of cheerleading, extracurricular activities and boys; she was sent to Annie Wright Seminary in Tacoma where she spent the rest of her highschool years. McCarthy's memoirs mainly only tell of her life up to this point and her struggle to find information regarding her past.