Notwithstanding the provisions of section twenty-six of chapter thirty-one of the General Laws or any other general or special law to the contrary, any son of Robert Martinello, a firefighter of the city of Chelsea who retired due to accidental disability on April sixth, nineteen hundred and ninety-five, who passes the required written and physical examinations for entrance to the fire service shall have his name certified for original appointment to the fire service before all other persons on the eligible list for such appointment; provided, however, that if more than one person is deemed to be eligible pursuant to the provisions of this act, the names of such persons shall be certified in the order of their respective scores on the open competitive civil service examination for such fire service.