Some bloody violence but nothing too graphic.
A man is killed from a pickaxe blow to the chest. Offscreen but bloody. Blood drips from his mouth and from the wound.
A man's throat is slit with a box cutter. This is offscreen, but you hear the slitting noice and the man's screams in pain; you also see the bloody box cutter and the man's bloody wound.
In a creepy and unsettling scene, while his mother is sleeping, one of the son's hands turns into a bloody, grey, bruised hand, which he uses to caress her face.