How would you improve your heart health?

I am very interested in keeping healthy, exercise, and eating right and things like that, especially while the weather is so nice. I am worried about my dad’s heart health, since he practices very unhealthy habits, such as eating huge meals and sleeping right after, and not exercising. He drinks five Coca-Colas a day. I am seriously worried and I have this lurking fear that when I become a heart surgeon, I might end up seeing my dad…. It seems irrational but is possible. Any advice I could give my dad? (or myself, I need to get back on exercise…. Been a while….)