Alexander Kage's parents, Arthur Kage and Kiara Watanabe, tragically died in a car accident, leaving him orphaned. He was later adopted by the Arashikage Clan, who raised and trained him.
Arthur Gates was the youngest of three siblings, with Patrick Henry Gates (from National Treasure) and Teddi Bruin (from Tracker) as his older siblings. After the death of their grandfather, the siblings were separated and placed in foster care, scattering the family.
This family history makes Alexander the nephew of both Patrick and Teddi Bruin. Following in his family's footsteps, Alexander also works as a tracker and rewardist, taking on high-stakes jobs that demand his unique skill set.
[Note: Alexander will do rewardist job for timeout stories, so you can expect stories like Taken to be included here.]