Dad maybe on Dialysis

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Dad not getting good word on his kidney function. He made it through Renal Cancer well (surgery was clean) and one of his kidneys is possibly shot from polycystic disease. Nothing is for sure but he may need to go on dialysis. He's 71.
I'm unmarried and without kids. I want him to see his grandchildren before he passes and I want to know I'm ready to be a man, alone, when he does. I can wipe my ass, I make my pay and pay my bills, but I still feel like I'm not a man. His mum died at 82 from breast cancer and his dad tarried on until a stroke finally got him.
Is dialysis a death sentence? is there a chance?