C755 Recollection(part ii)

He vaguely remembered the day his father died, he kept spitting out blood and staring at his mother with tears in his eyes. His mother was also crying, but she didn't dare to look at his father.

The poisoner had to be his mother.

His father must have known before he died, but by that time he had been unable to speak. His father probably didn't understand why his mother wanted to poison him