The Greyhound family was a family that was once the royal family of a fallen nation. Their country might have been small, but every citizen in it was an elite fighter. It was a country of warriors where even women were trained to fight. Yet it had fallen in the face of the larger more powerful country of the Granado Empire. The royal family of this long forgotten country were forced to shamefully escape from the enemy.
The first thing the Geyhounds did upon successfully escaping was to try and form an alliance with the other nations, to stop the advancing Granado Empire. That's what they tried to do, but failed horribly. The other nations at the time were at war with each other, and couldn't trust the each other to keep their word. So no one rallied to the Greyhounds call, soon after the other smaller nations surrounding the Granado Empire were defeated as well.