(b) At least one-half of the membership shall consist of:

(i) developmentally disabled persons or their parents or guardians or of immediate relatives or guardians of persons with mentally impairing developmental disabilities,

(ii) these may not be employees of a state agency receiving funds or providing services under the federal developmental disabilities assistance act or have a managerial, proprietary or controlling interest in an entity which receives funds or provides services under such act,

(iii) at least one-third of these members shall be developmentally disabled,

(iv) at least one-third shall be immediate relatives or guardians of persons with mentally impairing developmental disabilities,

(v) at least one member shall be an immediate relative or guardian of an institutionalized developmentally disabled person;

(c) The membership may include some or all of the members of the advisory council on mental retardation and developmental disabilities. 4. The developmental disabilities planning council shall meet periodically or at the call of its chairman. 5. The chairman, in consultation with the other members of the council, shall appoint and employ such personnel as he or she may deem necessary, prescribe their duties, fix their compensation and provide for reimbursement of their expenses within amounts available therefor from federal funds reserved by the state pursuant to the developmental disabilities assistance and bill of rights act or by state appropriation. 6. Members shall receive no compensation for their services but shall be reimbursed out of federal funds available therefor for all expenses actually and necessarily incurred by them in the performance of their duties.