Illinois Compiled Statutes 750 ILCS 75/25 – Prohibited civil unions

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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