I am sorry to learn that your father has some problems after his TURP. The way you have described is not normal after a TURP. The possibilities are either an uncontrolled infection or some narrowing of the urethra. It may be wise for your surgeon to perform urine culture, do a check ultrasound for any residual urine in the bladder and perform an endoscopy under general anaesthesia to make certain everything is fine. I am sure he will recover very soon.