The following civil unions are prohibited:
         (1) a civil union entered into prior to both parties
    
attaining 18 years of age;
        (2) a civil union entered into prior to the
    
dissolution of a marriage or civil union or substantially similar legal relationship of one of the parties;
        (3) a civil union between an ancestor and a
    
descendant or between siblings whether the relationship is by the half or the whole blood or by adoption;
        (4) a civil union between an aunt or uncle and a
    
niece or nephew, whether the relationship is by the half or the whole blood or by adoption; and
        (5) a civil union between first cousins.

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