According to the Hertz website... Only spouses or domestic partners can be the free additional driver. From their website
Authorized Operators
Acceptable Authorized Operators are automatically covered on the Rental Agreement.
Authorized Operators are:
- The employer, employee or fellow employee of renter on company business, (when booking includes company Corporate Discount Number).
- The renter's spouse for rentals that originate in California, Nevada or New York.
- The spouse or domestic partner of Hertz Number One Club Gold or Platinum members.
- Authorized Operators do not have to be present at time of rental.
- There are no fees for Authorized Operators.
Additional Authorized Operators
- Individuals not automatically covered on the Rental Agreement as Authorized Operators noted above need to be approved by Hertz after completing an "Authorized for Additional Operator" form.
- An applicable driving record will be performed - Additional Authorized Operators can be added at time of rental or at any renting location.
- Renter and each Additional Authorized Operator must be present to sign Rental Agreement, present an acceptable credit card (debit cards not acceptable) or current round-trip ticket (air, train or bus), show valid driver's license, and must be a minimum of 25 years of age.
(The credit card or round-trip ticket requirement does not apply to a spouse or domestic partner).
Additional Authorized Operators Fees
USD 7.00 per day, maximum USD 35.00 per rental, for each Additional Authorized Operator.
Exceptions -
California - no fee for Additional Authorized Operators
Nevada - no fee for the first Additional Authorized Operator. The second and subsequent drivers are USD 5.00 per day, up to a maximum charge of USD 35.00 per driver, per rental.
NY State - USD 3.00 per Additional Authorized Operator per day with a maximum charge of USD 36.00 per rental. This fee applies to all locations in New York State. Authorized and Additional Authorized Operators must be a minimum of 25 years of age.
AAA - Spouse/Domestic Partner of AAA members are not required to have a separate AAA membership in order to receive the free AAO privileges. For other rentals, the AAO fee is also waived when both the renter and the AAO are AAA members.
USAA - No charge for qualified Additional Authorized Operators who are USAA members when signing on to a qualified USAA rental.
AARP - No charge for qualified Additional Authorized Operators who are AARP members or member's spouse when signing on to a
qualified AARP rental.