the Kane Chronicles.

In the vibrant heart of Rundu, Namibia, lived the Kane siblings: Heilo, Seraphine, and Milla. To the world, they were the brilliant, enigmatic heirs of a burgeoning global empire. But in the shadows, Heilo and Seraphine were the elusive vigilantes, Tigerboy and Tigergirl, protectors of a city that didn't even know it needed them. Milla, the youngest, was their Chronicle, meticulously documenting their every move, every mystery, and every whisper of their incredible past... Unbeknownst to the legendary Bruce Wayne and Thomas Wayne Jr., the Kane children shared their very bloodline. From a future far removed and across countless universes, Heilo, Seraphine, and Milla were the younger siblings of the Wayne scions, though the present-day Waynes remained blissfully unaware. While Bruce revered his father, the Kane siblings held a profound, almost sacred, admiration and love for their mother, a sentiment that extended equally to their father. Their knowledge of their vast family history, lineage, and existence surpasses that of their older, present-day counterparts, and they are linked to them in the future through Cassandra Cain and Jason Todd.