Kaden Tau was born in 1908, 2 years after Maya's birth. His childhood is troubled with Maya Tau always bullying the young heir, causing deep distrust with his own sister.

Service in the Centauran War Aran Tau, father of Kaden wanted to consolidate support amongst the military and power. With it, Aran urges Kaden to join the Antares Imperial Army. However, unlike Maya, who was optimistic, Kaden reluctantly agreed into service. Kaden would participate in the Centauran War. However, knowing is risky to send the heir to the throne in frontline duties, Kaden was force into backline pacification of the countryside.

Even there, Kaden would experience combat, as the Riaan Army together with guerilla fighters, nearly wipe out the squad he led. Kaden would suffer trauma from the event, as he grudges on and continue to serve in the occupation zone even after the war's end. Witnessing the neutralization of the countryside.

Friction with his Father With Maya's death after the Centauran War, Kaden would be the sole child of Aran Tau. This doesn't make up, as Kaden develops a distrust over his father's more aggressive policies. The prince would conspire against his own father, in hopes of making a more liberal Antares Empire. By the time of DEAD AHEAD, Kaden would seek opportunity to contact the Hydran nations.

So umm, your Basically Kaden’s sister