Prologue:
It had been three years since the cell games. Gohan's life had gone down south. After defeating Cell, everyone discovered that people who the dragon considers committed suicide can't be wished back. Goku couldn't return. Three weeks after that, his mother discovered she was pregnant. Gohan had to suffer through his mother's saiyan pregnancy as the role of the father. That was more difficult than Cell. Gohan's misfortune didn't end there. His mother started to show signs of clinical depression. The sadness didn't end there. During the birth, Chi-chi experienced some complications. Bulma had said that all she needed to do to survive was fight it. She didn't. Chi-chi died in the birth. Gohan named the child Goten, the name Goku always said he would name his second son, should he have one.
Gohan's, and now Goten's, misfortune still hadn't reached its end. Hearing of his daughter's death, The Ox King died of a heart attack.
Hercule then quickly took up on the offer of Ox king's position in the world government, making Orange Star city his capital renaming it Satan City.
Gohan took up the role of father for a year. On Goten's first birthday, Goku used 14 of his 24 hours earned on Earth. It was the first time Gohan had been happy since before the cell games.
Back in the after-life, Goku was getting to know his own father. After a Super saiyan showdown, Bardock began explaining to Goku why he did what he did. Remembering this when he spent his time on Earth, Goku told his sons of their Grandfather. He told Gohan that despite everything he had done, Bardock was still a good person, and he doesn't blame himself for his mistakes. Only those who refuse to accept, show compassion, and think of others first should blame themselves.
Gohan had an attitude change that day. He gave up resenting himself, but he un-surfaced his years-in-the-making hatred toward his mother. She had called him a monster, suppressed his heritage, forbade him from fighting, and if she hadn't drilled into his head that violence was wrong, he would have destroyed Cell sooner, and his father would still be alive. To top it all off, she abandoned them.
v_v
It had been four years since Goku had last been on Earth. 5 year-old Goten was now old enough to begin school. Although 16 year-old Gohan resented how his mother had taught him, he didn't want Goten growing up without any education, so a month ago today; he had decided to enroll Goten in public school. His inheritance from his father and the ox king had kept them fed, but that money was slowly running out. He couldn't afford the private schools in west city, so he had to choose a public school, in Satan city.