If your dad was my dad, I'd make sure he took at least 5000 mg of vitamin C throughout the day (in divided doses) and a minimum 4000 I.U. of D3.
Co Q10 has to be in the unoxidized form to be of any value, due to his age.
Just open one of the gel caps, if it is orange it is oxidized, and he won't be able to convert it. Therefore, he needs Co Q10 in ubiquinol form. (white or light color)
For his emphysema, I would suggest several natural antifungals, such as olive leaf extract, grapefruit seed extract, and would get him to nebulize a small amount of colloidal silver per day. The silver should be at least 10 ppm, and should be clear and have a neutral pH.
Also Taurine and cayenne pepper for his heart, along with lots of potassium, magnesium, and vitamin E as mixed tocopherols.
That would be a good start.
Let Food Be Your Medicine And Medicine Be Your Food.(Hippocrates)