Explanation (2)

Since Kinsey was raised by Alpha II, Savannah's grandson, he often shared the Paxton family tree with him.

Savannah Paxton, one of the twins, passes on his family history to his children and continues to his descendants. The red king's history, the Tettero family, and the Oostven tribe; all Savannah descendants know about it.

Unlike his brother, Zedakh did not care about the origins of his grandparents. He only cares about developing business and controlling the world economy. So that Zedach's children and grandchildren knew nothing about the Red King and the four rulers who ruled in Prussia.