(a) For the purposes of making a decision to withhold or withdraw life-sustaining treatment pursuant to this section, in the case of a person for whom no guardian has been appointed pursuant to section seventeen hundred fifty or seventeen hundred fifty-a of this article, a "guardian" shall also mean a family member of a person who (i) has intellectual disability, or (ii) has a developmental disability, as defined in section 1.03 of the mental hygiene law, which (A) includes intellectual disability, or (B) results in a similar impairment of general intellectual functioning or adaptive behavior so that such person is incapable of managing himself or herself, and/or his or her affairs by reason of such developmental disability. Qualified family members shall be included in a prioritized list of said family members pursuant to regulations established by the commissioner of the office for people with developmental disabilities. Such family members must have a significant and ongoing involvement in a person's life so as to have sufficient knowledge of their needs and, when reasonably known or ascertainable, the person's wishes, including moral and religious beliefs. In the case of a person who was a resident of the former Willowbrook state school on March seventeenth, nineteen hundred seventy-two and those individuals who were in community care status on that date and subsequently returned to Willowbrook or a related facility, who are fully represented by the consumer advisory board and who have no guardians appointed pursuant to this article or have no qualified family members to make such a decision, then a "guardian" shall also mean the Willowbrook consumer advisory board. A decision of such family member or the Willowbrook consumer advisory board to withhold or withdraw life-sustaining treatment shall be subject to all of the protections, procedures and safeguards which apply to the decision of a guardian to withhold or withdraw life-sustaining treatment pursuant to this section. In the case of a person for whom no guardian has been appointed pursuant to this article or for whom there is no qualified family member or the Willowbrook consumer advisory board available to make such a decision, a "guardian" shall also mean, notwithstanding the definitions in section 80.03 of the mental hygiene law, a surrogate decision-making committee, as defined in article eighty of the mental hygiene law. All declarations and procedures, including expedited procedures, to comply with this section shall be established by regulations promulgated by the commission on quality of care and advocacy for persons with disabilities.