Unless the council shall by majority vote, and shall record as part of its official proceedings, determine that the best interest of the city shall be served, family members of any elective or appointive officer are disqualified from holding any appointive office or employment during the term for which said elective or appointive officer was elected or appointed. This section shall in no way disqualify such family members who are bona fide appointive officers or employees of the city at the time of the election or appointment of said official.