Hi My Dad Did A Heart Surgery 7weeks Ago Repaired

Hi my dad did a heart surgery 7weeks ago repaired the main artery to his heart he developed bleeding complications they had to remove large parts of his intestines due to gangreen now his heart is only working 20% his blood pressure is 50/20 his kidneys and liver stopped working he is swollen to the point of his skin bursting and oozing fluids his brain score was 2 out of 10 is there any chance he can survive. Whenever we speak to him he responds by shaking his head he was taken off life support 12 hours ago and is still breathing on his own what are his chances