Illinois (amended) Certification of Relatedness is a form that is used to establish the legal relationship between two individuals in the state of Illinois. This form is most commonly used when establishing paternity or when applying for various benefits, such as Social Security or insurance benefits. The form is administered by the Illinois Department of Healthcare and Family Services and is available online. The form requires both parties to provide identifying information, such as their names, addresses, and dates of birth, and to sign the certification. There are two types of Illinois (amended) Certification of Relatedness: standard and amended. The standard form is used for individuals who are related by birth, marriage, or adoption. The amended form is used for individuals who are related by blood, marriage, or adoption but have different parents. Both parties must sign the form and have it notarized for it to be valid.