Really fuckrd up rn about how fable 3 is the only on of the main three games where the player character has no goal of reuniting with their sibling in some way.
The hero of oakvale has no idea that Theresa's alive but also no idea if shes dead, unlike with Brom he doesn't see her body, it lets him live with the hope that she's still out there, and she is, and while their reunion is short, Theresa being drawn to do other things, our hero had the comfort that she is alive, able to sufficiently take care of herseld, and she has an idea of how to find him.
Sparrow wants to avenge Rose, to take Luciens life in a way that is more intentional than his taking of their sisters was. They think getting revenge will sooth the ache in them, to bring them closer to who they used to be before they lost the only person they had that cared. And then, at the end, they are given a moment, a single moment of hope that they're going to get their sister back, just to have it snatched away as quickly as it's given. Sparrow never reunites with their sister, they never really thought they could, but they had hoped, and are left with the hollowness that comes with it that hope being cut from them.
But the Hero of Brightwall? They give up on Logan, and are never really shown to want him back. They consider their relationship with him ever fractured after what happens with Elliot/Elise, and everyone else tells them he is a lost cause, and they don't refute it. They show no desire to bring their brother back to who he used to be, perhaps they don't even remember that version anymore, they spare his life, but spend no time with him, they don't forgive him, they don't resist when he says he's going to leave Albion. They know now that Logan was put in an impossible postion, but that part of them, the part that's still angry with him, the part that heard all throughout their journey how Logan is an insult to their parents memory, a blemish on their lineage, entirely unforgivable, wins out above any part or them that still loves their big brother and wishes to keep him close.
Fable 3 is the final fracturing of a family that for generations has been fighting to stay together, even through death, and we never get to see them come back together.