How to prevent heart diseases?

How? My dad has hypertension. He doesn't exercise, and spend most of his time in bed, sleeping. Yeah, a very simple lifestyle. After work, doing the necessecities, then eat, read newpaper, watch television, then read a book, then sleep, and next morning will be the same. His diet, are normally, vegetables, moderate oily (olive oil) sometimes, sunflower oil, soup, yeah. But occasionally, his company will invite them to indulge themselves in restaurant food items. ( My dad works in a flour and bakery company, so yeah).
He has hypertension. How am i gonna prevent him form any complications, without exercising?

[swaraj29]

Give him  vitamin C 2000 mg, natural vitamin E 800 IU,fish, omega 3 fish oil capsules(4 daily) and a B Complex capsule and potssium rich foods.He will be safer