What is the name of Astar's sister organization?

As a keen observer of the cryptocurrency and finance world, I'm curious to learn more about the interconnected ecosystem of various blockchain projects. One such organization that has piqued my interest is Astar. However, I've come across mentions of a so-called "sister organization" associated with Astar, and I'm wondering if you could clarify the exact name of this affiliated entity. Could you please enlighten me on the name of Astar's sister organization and perhaps provide a brief overview of their relationship and any shared goals or initiatives?