Prohibited Civil Union

A prohibited civil union is a civil union between two partners that is not allowed by the state of Illinois, and can therefore be declared invalid (annulled)


The following civil unions are considered legally prohibited:


  • a civil union that took place before another civil union or marriage was dissolved

  • a civil union between siblings, half-siblings, or adopted siblings

  • a civil union between a full or half nice or nephew and full or half aunt or uncle

  • generally speaking, a civil union between first cousins