I'm so confused with this plot device
What does adding a mysterious brother add to the current plot? Unless it has to do with the shadiness of the father, I really don't know what this is gonna lead to.
My worry about this is it's not gonna have a sensible/rewarding ending to it. I feel like the author wants a little too much for this manga, and at the end gets nothing out of it because he complicated it too much to make a subversive story. Hopefully I will be wrong.