If you are dying from kidney failure, any your skin starts to turn brown, how long do you have left after that

my nephew who is 16 has almost total kidney failure, his skin has started to turn brown, he is very swollen feet, back, stomach, tongue, gums,etc. he is throwing up most foods, coughing all the time, sleeps a ton, hospice has told my sister is time to think about telling his younger brothers what is happening. How... show more my nephew who is 16 has almost total kidney failure, his skin has started to turn brown, he is very swollen feet, back, stomach, tongue, gums,etc. he is throwing up most foods, coughing all the time, sleeps a ton, hospice has told my sister is time to think about telling his younger brothers what is happening. How much time do we have. He is just suffering, I hate to see it. I am so worried that it is just days, that he has left, he is cold alot of the time. I don't want him to suffer, but I am so not ready to let him him go yet. He has not been told that he is dying, although I am certainly sure he knows that something is terribly wrong. My sister has not asked hospice how long, I don't think she wants the answer. They just said they didn't think it would go this fast. What does that mean?? Can anyone help me with an answer. Thanks. My heart is breaking. His wish was to Mary Kate and Ashley Olsen and I wrote them twice and never got a response. I makes me so sad, they couldn't help.
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