Our family doctor (she practices Chinese Medicine) suggests footbaths, 15 minutes before bedtime, to increase kidney energy, and also in case of almost any other serious condition.
I hope your father finds his way out of this, with your help. Fields are a great way to address the condition on multiple levels (not just physical). Sending love (and also suggesting playing a couple of love fields, along with healing ones)
In TCM, the emotion associated with kidneys is fear. (weak willpower, insecurity, isolation)