First there are many natural ways to thin the blood and dissolve blood clots. I have had numerous patients with the exact same problem as your father that healed themselves completely.
The main problem is that he should be the one to be writing me!
But a few suggestions would be, to first STOP the number one blood thickener, STOP EATING ALL ANIMAL FOOD, PERIOD!
Then START on my Heart Tonic which has many powerful natural blood thinners in it like Red Clover and Garlic.
He should consume at least 3 cloves a day of raw garlic, chopped up in food or just swallowed,
I could tell you many more things but have him write me, just the action will thin his blood and help his heart and lungs.
Dr. Richard Schulze