William has a permanent intellectual disability that renders him lacking “capacity to make or communicate responsible decisions concerning his person . . . because of a mental disability or disease[.]” By petition filed on April 24, 2023, Parents asked the court “to modify the current Guardianship order” in four respects: (1) to “allow William the right to vote;” (2) to appoint Parents as guardians of William’s person and property, with authority to open and maintain bank accounts, secure public benefits, and manage assets; (3) to name Parents “as Supported Decision Makers for William,” under E&T § 18-103; and (4) to name “William’s family friend Andrea Waring, and aunt, Dr. Yulanda Swindell, M.D., as successor Supported Decision Makers,” under E&T § 18-107(c)(2). In support, Parents filed a Physician’s Certificate under Md. Rule 10-202(a), identifying William’s diagnoses as of January 10, 2023, as “intellectual impairment,” “speech impairment,” and “scoliosis,” with “moderate” “[m]emory, cognitive, and executive functioning” and the need for appropriate support to live in the community. According to the examining doctor, William was “unable to make decisions regarding: his finances/if he should or should not have a medical procedure done. Emergency situations such as electricity problems/basement flooding” and “[d]ecisions such as needing a lawyer or any professional.” Likewise, a licensed clinical social worker assessed that William’s “[i]ntellectual impairment,” although “moderate” with respect to “cognitive function,” “severely impacts [his] ability to make complex decisions and ability to communicate clearly.” In her opinion, he needed a guardian of his property because he was able to make “simple daily 8