Your report suggests that your father is suffering from diabetic nephropathy
which has resulted in chronic kidney disease(CKD).This CKD then progresses towards kidney failure called as ESRD ( end stage renal disease
The fact is there is no treatment of CKD.
There are treatments employed like slowing the progression of disease and treating the cause,contributing factors and complications of CKD.
Treatment involves restriction on your protein,potassium,fluid ,analgesics,anti biotics like gentamicin
Treatment involves controlling high blood pressure
,diabetes,loosing weight,taking care of anemia and low VIT D,etc.
The treatment involves stopping all oral anti diabetics and using only injectable insulin.
The fact remains that you may prolong the progression of your CKD status to end stage kidney disease but you can't prevent it happening.
Your father may pull along for some more time but eventually he has to go for dialysis and then it would be a regular feature with him till you get his kidney transplant
You must discuss with your doctor and start planning for the kidney transplant ,so that your father may be able to enjoy his life normally.