I don't understand anything I need someone to explain whats going on

basically one eyed guy is the adopted son of the white haired guy but before the white haired guy got possessed he was a slut in the nicest way possible but he never like the boy and now the white haired guy fell into a fever but was unconsciously walking around people but in his head it was empty but after he stabbed the boy he was back in reality he didnt wanna b left alone again like a wondering spirit

Actually he had Black hair before he was possessed by the imuogi (forgive my sm)

I FORGOT THAT