35 ILCS 405/12
A parent, without being appointed guardian of the person or guardian of the estate, or a guardian of the estate, or, if no guardian of the estate has been appointed, a guardian of the person, of any minor or person with a disability whose interest is not adverse to the minor or person with a disability , may make any election and sign, without court approval, any agreement on behalf of the minor or person with a disability under (i) Section 2032A of the Internal Revenue Code for the valuation of property under that Section or (ii) Section 2057 of the Internal Revenue Code relating to deduction of the value of certain property under that Section. Any election so made, and any agreement so signed, shall have the same legal force and effect as if the election had been made and the agreement had been signed by the minor or person with a disability and the minor or person with a disability had been legally competent.
This amendatory Act of the 91st General Assembly applies to elections and agreements made on or after January 1, 1998 in reliance on or pursuant to Section 2057 of the Internal Revenue Code, and those elections and agreements made before the effective date of this amendatory Act are hereby validated.
35 ILCS 405/12