Subsection (a) of such section is amended by adding at the end the following new paragraphs: (11) Notwithstanding any other provision of this subsection, a family caregiver of an eligible veteran who is eligible under paragraph (2) solely because of a serious injury or illness (including traumatic brain injury, psychological trauma, or other mental disorder) incurred or aggravated in the line of duty in the active military, naval, or air service before September 11, 2001, is eligible for assistance under this subsection as follows: (A) Not earlier than October 1, 2018, if the family caregiver would merit a monthly personal caregiver stipend under paragraph (3)(A)(ii)(V) in an amount that is in the highest tier specified in the schedule established by the Secretary under paragraph (3)(C)(i). (B) Not earlier than October 1, 2020, if the family caregiver would merit such a stipend in an amount that is in the middle tier specified in such schedule. (C) Not earlier than October 1, 2022, if the family caregiver would merit such a stipend in an amount that is in the lowest tier specified in such schedule. (12) (A) In providing assistance under this subsection to family caregivers of eligible veterans, the Secretary may enter into contracts, provider agreements, and memoranda of understanding with Federal agencies, States, and private, nonprofit, and other entities to provide such assistance to such family caregivers. (B) The Secretary may provide assistance under this paragraph only if such assistance is reasonably accessible to the family caregiver and is substantially equivalent or better in quality to similar services provided by the Department. (C) The Secretary may provide fair compensation to Federal agencies, States, and other entities that provide assistance under this paragraph. (D) In carrying out this paragraph, the Secretary shall work with the interagency working group on policies relating to caregivers of veterans and members of the Armed Forces established under section 7 of the Military and Veteran