(Just saying I'm terrible with backstories so don't judge, k?)
When he was a young boy, he didn't know much about his parents, but he still loved them to death and they loved him back. He was a loner back in his youth so he would spend the majority of his time in his Father's Gym or Mother's library. His Father taught him how to survive if he was ever alone in his Teenage years - Adulthood. But then, sometime in his Teen years, he finally figured out what his parents did for a living, after sneaking out and following them, it wasn't what his family has been doing for generations (He lived in an evil family b/e evil oc). He figured out that his Mother worked at a Hospital and helped people in need when he was told that they kill others and then rob them. His Father is a cop that stops crime when they create the crime. So after he figured out what both of his parents did, he ran back home, he packed up everything he needed, and then ran away in the woods and hoped that his parents wouldn't find him. After about a year of hiding he saw a group of people wandering in the woods and they accepted Hades into their group and he actually liked it a bit. But after they learnt more about him, he ran back into hiding and now he's trying to hide from them because he's scared they will try to hunt him down.
(Once again, Bad with backstories and this was just on the fly)