In this article, our McHenry County adoption lawyers explain the different types of adoption in McHenry County Illinois. Related adoption occurs when one of the parents is related to the adoptee. Agency adoption is when the adoption is from an adoption agency. Private adoption occurs when neither parent is related to the child and the adoption is not through an agency. Standby adoption occurs when a terminally ill parent agrees to the adoption in advance. Finally, adoption of an adult occurs when the adoptee is over the age of 18.