My Dad Is In Hospital. He Had Prostate Cancer And

My dad is in hospital. He had prostate cancer and surgery with radiation "years" ago. Left him with bowel issues and bleeding from penis from scar tissue. Now in hospital with rectal and penis bleeding. he is 84 years old. He is an alcoholic for many many years. Last night he said he was up every hour and a half with green/mucus coming out of his rear that left his butt "on fire" what could this green now be??? I am scare for him!! YYYY@YYYY