568.Where a surviving spouse who exercised an option provided for in section 559 or 562 dies, the persons who are still, at the date of that death, persons dependent upon the predeceased worker, within the meaning of the Workers’ Compensation Act (chapter A-3), are entitled to receive, from the date of the spouse’s death, the monthly benefits to which they would be entitled under the said Act if the spouse had not exercised the option.