That is good control only What is ur father's age Is he on any medication? Is there any other symptoms he had Need to know detail case history

That is a good control. Keep a watch on HbA1c levels.  Those are more likely to suggest control. 

if your father doesn't have any other health issues..This sugar level is not too high!! Proper diet and some simple exercises are enough to manage this.

What is your fathers age? Is he on any other medications? Do consult. There are best medicine in Ayurveda for diabetes and they are absolutely safe. And the numbers are in controllable ranges.

Try with Nishakathakadi kashayam 15ml bd Glycem cap 1tid

Diabetes should be kept under check by proper medication. Any sudden surge of blood sugar may cause more damage to the body. Take proper prescription medication.

Kindly share complete info and history of ilness. Any symptoms occurred, age working condition. Follow diet , included prescribed yoga, and ayurvedic medicine prepration amla powder and haldi in equal amount daily 3 grm bd before meal.

Use some Ayurveda herbs

You can take haldi juice with equal amount of amala juice ,in empty stomach For better medicines take a direct consultation ....so that can discuss your issue ...can make some changes in diet and manage accordingly

Find out root cause of your problem by ayurved way diagnosis Correct it by ayurved way medicine diet and lifestyle corrections Finding out root cause and its cure is very important for improvement permanent cure Correct diagnosis by ayurved way is very important main factor in treatment Take any ayurved medicine after proper ayurved way diagnosis only for avoiding bad effects of intake