hi. it seems from your question that your father is suffering from uncontrolled diabetes
. The numbness which you have described is due to diabetic neuropathy
whihc he has developed as a complicatiuon of diabetes. Cause of frequent urination
could be either uncontrolled diabetes or a urinary tract infection
or enlargement of prostate gland which is quite usual in old age. He needs to undergo a detail evaluation of all these complications and requires the services of a diabetologist
. More over he is also prone to develop diabetic kidney disease. All these complications can be managed adequately and there is no need to worry.