The Illinois Affidavit of Adopting Parents is a form used in the adoption process to provide proof that an adoption is in the best interest of the child. This form is required by the state of Illinois, and must be signed by the adoptive parents before an adoption can be finalized. It is also used to document the adoption process and verify that the adoptive parents meet the state's requirements. There are two types of Illinois Affidavit of Adopting Parents: one for stepparent adoptions and one for relative adoptions. For a stepparent adoption, the affidavit must be signed by the biological parent with custody of the child, the stepparent, and the adoptive parent. For a relative adoption, the affidavit must be signed by the person placing the child for adoption, the relative, and the adoptive parent. In both cases, the form must be notarized and submitted to the court before an adoption can be finalized.