38 CFR § 1.524 - Persons authorized to represent claimants.
A duly authorized representative will be:
(a) Any person authorized in writing by the claimant to act for him or her,
(b) An attorney who has filed the declaration required by § 14.629(b)(1) of this chapter, or
(c) His or her legally constituted fiduciary, if the claimant is incompetent. Where for proper reasons no legally constituted fiduciary has been or will be appointed, his or her spouse, his or her children, or, if the claimant is unmarried, either of his or her parents shall be recognized as the fiduciary of the claimant.