William

He may be a lazy, constantly horny idiot, but he is also sadistic, impulsive and power hungry. Your brother is a ticking time bomb. It wouldn’t surprise you, if he had his hands in the murder. He knows hitman of your father and he directly said to you, that he doesn’t accepted another heir despite him. Maybe your mother was not the only target of this killer.

His motive was likely you. You turned 18 and by agreement of your mother, you should meet your father soon. He maybe wanted to eliminate all possible heir. Or he considered it an insult that a woman would have the same rights he has. He clearly views woman inferior. But whatever his motive was, you have to be careful around him. The spoiled asshole is clearly up for some surprises.