When Raven's father returned to Ardania, he returned to one of his manor-estates, which he had settled on his older sister, the Lady Cordelia Fox, to live. Lady Cordelia took on the responsibility of caring for her brother and his daughter, as well as her own husband (Sir Michael Fox) and children. She could very well have fostered Stephen, or he could have visited (as a relative). We know that he was there for at least a brief time, because Raven admits to having had a crush on him in her early teens. Blackhawk could have been one of Michael's children, or he could have been another fostered-brother.

Or you can make up something completely different. Just make sure everybody gets the story straight.

As regards Uncle Maximillian Fox. No.... he's not actually your immediate uncle. But he really prefers to be called "Uncle Max"... I think he enjoys hearing that because he doesn't really have many opportunities to feel like belonging to a family because he has been gone for so many years of his life.

Max is the 4th son of the Earl of Dolan (Henry Fox, the Duke's brother). He's never been married, although he has been linked with many of the most admired ladies in the Kingdom. His cousin (Raven's father) is the oldest son of Lady Anne Harville-Fox (The Duke's Wife's Sister) and Theodore Fox, Baron of Bexley. Obviously, then, Lady Cordelia Fox is one of her daughters.