Final answer:
Family members, legal guardians, and healthcare providers are authorized to grant consent for another person.
Step-by-step explanation:
The individuals who are authorized to grant consent for another person include family members, legal guardians, and healthcare providers. Family members, such as parents, can provide consent on behalf of their children who are not competent to provide consent for themselves.
Legal guardians are designated individuals appointed to make decisions on behalf of another person who is unable to make decisions for themselves. Healthcare providers, such as doctors, have the authority to give consent for medical procedures or treatments for their patients.