My prayers are with Eddie, your sister and family. Continue to pray, pray & pray.
I truly believe in the power of prayer and remember God chooses when.
My brother was very sick and no diagnosis, this went on for months, in April was sent to CDC in San Antonio and was diagnosed with TB was so advanced that he was sent home with Hospice. We got home and hospice took over the following day, 3 weeks later my brother gained 12 lbs (was down to 103 lbs) and Dr.'s don't know how but his lungs, especially one of them were healing. He is off Hospice and while still needs oxygen to breathe, he is doing great. He now showers by himself and fixes tools while sitting at the table. Only God knows when and while the Dr.'s were saying any day, he is still here and continues to get better. They even told us that he may be off the oxygen by March but even if he needs it for the rest of his life, we are okay with that.
Blessings to your family