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Your father can eat all fruits, dry fruits, vegetables, low-fat dairy products including milk without cream, one whole egg or two egg whites per day, fish, chicken, salad, pulses, lentils, and legumes.
Limit red meat and salt to minimum. Spices can be taken to add flavor to food if low salt diet tastes unpalatable. Avoid processed foods, canned foods, sweets, and soft drinks even if not diabetic.
Eat fish at least twice per week. If he has diabetes, then keep fasting sugar below 130, and random sugar below 200. Avoid sedentary behavior, do regular aerobic exercise, take all medicines, and follow-up your cardiologist regularly to adjust the dosage of drugs.