"No. My father is actually a Fire Giant, and took another woman as his wife when the one he wanted wasn't available. It's...complicated. But she was less than ideal as a wife or a mother, and Dad took us away to Asgard." To protect them. That was surely what he had intended. It probably would have been better for the three of them to leave them with her, rather than let them have control.
"My brothers and I, we're different." Hel used her deformed hand to indicate her appearance. "Well, obviously. And people don't like different."
Hel realized she was still trying to be tactful. Why? What did she owe Asgard to wish to protect it? Nothing. Absolutely nothing. At the thought, a small bubble of rage tried to climb its way up to the surface.
"They thought my brothers and I were monsters that could end their very existence. They thought it far better to remove the threat than seek the truth. I was lucky. I got another world to dwell in, and even rule, even if many of my subjects greet me with initial fear, or worse. My brothers are bound, like my father, in an attempt to squelch that threat. Because that somehow seemed like the best way to handle things."
Realizing how bitter she sounded, Hel quickly gave Styx a look of apology. "I'm sorry. Sour grapes."