However, it will require your dad's permission and approval. He may need to sign the application, answer some health questions, and possibly be required to take a physical examination.
An insurable interest is required when buying life insurance on another person. This means, you stand to lose financially if the insured person were to die.
There does exist an insurable interest between parents and their children, because parents may be supporting their children financially, and their child may need to provide for a funeral/burial for the parent.
Learn more about how you can buy term life insurance online.