Should older men with congestive heart failure disease take Vitamin E and Fish Oil?

They both will thin out the blood. If he is already on a bloodthiner medication he shouldn't be taking these. I think Fish oil has Vitamin E in it. So he doesn't need both.

Talk to his cardiologist. They will help you understand supplements, my dad saw a dietitian and she helped us figure out what he should be taking and what he should avoid.

This is clearly a question that only a treating physician should answer.  Don't take any chances!