That's right. An adult child may have Insurable Interest in his/her father.
That means you may buy a life insurance policy on your dad, with his permission and signature on the application for coverage.
Many adult children buy life insurance on their fathers because their fathers may not have the money saved to cover the cost of their final expenses.
In addition, there are life insurance plans available with guaranteed acceptance, which means your dad can get insured even if he has been turned down for life insurance before by other insurance companies.
So, even if your dad has health issues, you can get life insurance for him.
Learn more about getting life insurance on your Dad.