Because of this, Marko’s father spent most of his earnings on alcohol, and would often come home during one of his alcoholic episodes to resort on beating up both Marko and Sergio. It is apparent that Marko’s father was desperate for his son’s attention, as he would often drag both him and his brother aside during their spare time to teach them the general knowledge of mechanical work despite their protests. He had plans for his two sons to work with him in the maintenance department when they would come of age, which Marko dreaded. Marko’s father, despite his hatred of working in the maintenance department, had remarkable skills that were recognised by the Overseer. Because of this, he did not pay attention in the vault provided school and presumably received low grades as a result, which his father did not approve of and would often destroy his books to discipline him, which did not even phase him as he had endured enough fantasy to make up one of his own in his mind. Marko was anti-social and hated living in the vault, finding it to be the equivalent of living in a prison, he dreamed of going outside and seeing the real world, often spending his spare time reading comic books and literature to escape from reality. Marko cared for his step-brother and it is hinted that he adored him.

At some point during his childhood, his father married a female with a 'timid soul' whose last name was Booth and took in her son Sergio, who was younger than Marko by five years. Not much is known about his parents, other than his father worked in the maintenance department to provide for the family, and there is no mention of his biological mother. Marko was born in an unspecified vault somewhere in the East provinces of America. All of which may be a fabrication, but the context of the story contains similar elements to known facts about Marko, which suggests to some extent, that it may be true. The following is based on information Marko gives away while under his alias.

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