It's funny, because I've seen a ton of debate about this in the comments section of the app where I read it. The novel sets up this classic trope where the seemingly weakest or most overlooked family member ends up being the real power. For a long time, you're led to believe it's the arrogant eldest son, maybe the secretly cunning daughter, but the author pulls a pretty clever bait-and-switch.
To me, the real heir is Jasper. He's the cousin who gets introduced mid-way as a comic relief side character, always getting into scrapes. Everyone underestimates him, including the family elders. But there's this one scene where the patriarch's will is being read via a hologram—it's very high-tech—and it's revealed that the true measure of leadership isn't business acumen but 'moral resilience' during a crisis they all faced as kids. Jasper was the one who secretly took the blame for a broken heirloom to protect his sister, an act the old man witnessed.
The story then becomes less about a bloodline and more about who embodies the founder's original principles. It's a bit cheesy, sure, but it works because Jasper's growth from a goof-off to someone actually trying to live up to the responsibility feels earned. The other siblings are all fighting over the title, but he never wanted it, which ironically makes him the perfect choice in the narrative's logic.