Illinois Statutes Chapter 750. Families § 80/10. Equal access to marriage

(a) All laws of this State applicable to marriage, whether they derive from statute, administrative or court rule, policy, common law, or any other source of civil or criminal law, shall apply equally to marriages of same-sex and different-sex couples and their children.

(b) Parties to a marriage and their children, regardless of whether the marriage consists of a same-sex or different-sex couple, shall have all the same benefits, protections, and responsibilities under law, whether they derive from statute, administrative or court rule, policy, common law, or any other source of civil or criminal law.

(c) Parties to a marriage shall be included in any definition or use of terms such as “spouse”, “family”, “immediate family”, “dependent”, “next of kin”, “wife”, “husband”, “bride”, “groom”, “wedlock”, and other terms that refer to or denote the spousal relationship, as those terms are used throughout the law, regardless of whether the parties to a marriage are of the same sex or different sexes.

(d) To the extent the law of this State adopts, refers to, or relies upon provisions of federal law as applicable to this State, parties to a marriage of the same sex and their children shall be treated under the law of this State as if federal law recognizes the marriages of same-sex couples in the same manner as the law of this State.