Payment of hospitalization charges shall not be a necessary requirement for voluntary admission: PROVIDED, HOWEVER, The department may request payment of hospitalization charges, or any portion thereof, from the patient or relatives of the patient within the following classifications: Spouse, parents, or children. Where the patient or relatives within the above classifications refuse to make the payments requested, the department shall have the right to discharge such patient or initiate proceedings for involuntary hospitalization. The maximum charge shall be the same for voluntary and involuntary hospitalization.