My Father Is 86, Almost 87. He Is In The

My father is 86, almost 87. He is in the hospital with a MRSA bloodstream infection, but he seams to be responding to the antibiotics and is stabilizing - kidney function is ok, breathing on his own. He has had multiple strokes and has developed fairly severe Parkinsonism (knees locked in bent position and can no longer stand or walk). He has Stage 3 kidney disease. The doctors just diagnosed him as having congestive heart failure (water in the lungs - no pneumonia, swelling of the ankles/lower leg). His ejection rate is only 25%. I'm trying to determine how long he has left to live.