STAGE IV Non Small Cell Metas. to Brain

Hi, My dad was diagnosed with Lung cancer that has spread to his brain. The only symptoms that he has are: Loss of weight, Fatigue, and Double Vision (From Brain Tumors). After 3 treatments of Chemo and 14 days of Full Head Radiation he his looking worse than ever. Since than he has given up on treatment and is going through at Home Hospice. The Dr. has given him weeks to live and I wanted to know what should I be expecting in the near future to happen. I want to know when his time is coming so I can make preparation for his family to be by his side.  ...