Painful legs in diabetic patients can have several causes, it is therefore best if your dad can go and see his doctor. Good control of his glucose is very important as uncontrolled blood glucose can contribute to the pains - he should monitor his glucose levels and you didn't mention his HbA1c (average glucose over the preceding 2-3 months), so I cannot really comment on that. Other causes may be neuropathy - one of the nerve complications of diabetes, or vasculopathy - where the blood flow to the legs are impaired, or he may have electrolyte disturbances. Most of these can be improved with proper management and it is thus worthwhile going to his doctor.
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