If your father has been declined for life insurance, or unable to find a life insurance company willing to offer coverage, you may want to consider guaranteed life insurance coverage.
Guaranteed plans usually offer a small amount of life insurance without any physical exam, but the coverage is graded, meaning you do not have full coverage until the insured person has owned the life insurance for at least 2-3 years, depending on the insurer and the life insurance policy.
Here's how you can learn more about guaranteed acceptance life insurance plans.