Another way older children can be placed for adoption is where the birth parents' rights were terminated by a court due to improper parenting or abuse. Although the child may still foster idealized feelings for that failing parent it is not uncommon in these adoptions for there to be no contact between the child and adoptive parent, and the birth parent.
The probate laws of most states in the U.S. prohibit an adoptee from automatically inheriting from his or her birth parents. This applies regardless of whether or not the birth father participated in or agreed to the adoption. Had the adoption not have taken place, any son or daughter would be an heir upon his or her father's death—regardless of who his childhood caretakers were. There can be additional complications if the birth father has subsequently moved to another state. Should a birth parent include an "unknown" adoptee in his or her will, the probate court has no obligation to fulfill this type of request, while "known" adoptees may have the same status as non-family members. However, there is some variation in probate laws from one state to another.
Open adoption is the exact opposite of a closed adoption. In this situation, there is some kind of fellowship between the birth and adoptive parents and the adopted child. Generally, there is an exchange of identifying information (e.g. first and last names, home address, phone number, etc.) and contact is retained between the two parties. There are several examples of an open adoption, including:

From the early 1950s when Jean Paton began Orphan Voyage, and into the 1970s with the creation of ALMA, International Soundex Reunion Registry, Yesterday's Children, Concerned United Birthparents, Triadoption Library, and dozens of other local search and reunion organizations, there has been a grass roots support system in place for those seeking information and reunion with family.
Over the past few decades, we’ve found that the majority of prospective birth mothers are looking for an adoptive family they can have a personal relationship with before, during and after the adoption process is complete. Therefore, we require our prospective adoptive families to be open to the kind of communication most of these birth mothers are looking for, including:
In all adoption searches, it is uncommon to find both the birth mother and father at the same time. A separate search, if desired, can be done afterwards for the father. Since males seldom change their surnames, and the mother might have additional information, it is usually easier than the initial search for the birth mother. In many cases, adoptees are able to do this second search for their birth father by themselves (or they try before paying for assistance).