I would like to ask a question regarding adoption. I have a friend who is already 24 years old and has been legally adopted since birth by a childless couple. Now, she wanted to unadopt herself because she found out who her real parent is--it was the former maid of the household. Can she unadopt herself and make a new birth certificate which states who her real mother is? Is it possible to change her surname to her biological mother's? Thank you.