Best wishes on your search journey. Hopefully the non-id will answer some questions about your brother and will let you know if he stayed in foster care rather than being adopted. If he wasn't adopted and is still using the name Richard (Rick) Parker it should be easier to find him.
Other great websites to check out!
http://www.adoptionchat.com
http://www.adoptionlists.com
http://www.adoption.com
http://www.adopting.org
http://www.adoptionregistry.com