E.g. In Manila: http://www.manilatimes.net/news/nation/rescission-of-adoption/
http://www.manilatimes.net/news/nation/woman-wants-to-rescind-her-adoption/
<quote>
Section 19. Rescission of Adoption of the Adoptee. – The petition shall be verified and filed by the adoptee who is over eighteen (18) years of age, or with the assistance of the Department of Social Welfare and Development, if he is a minor, or if he is over eighteen (18) years of age but is incapacitated, by his guardian or counsel.
The adoption may be rescinded based on any of the following grounds committed by the adopter:
1. repeated physical and verbal maltreatment by the adopter despite having undergone counseling;
2. attempt on the life of the adoptee;
3. sexual assault or violence; or
4. abandonment or failure to comply with parental obligations.
</quote>
See also:
http://www.justanswer.com/family-law/1imk2-rescind-adoption-stepparent-texas.html
http://legal-forms.laws.com/michigan/petition-for-rescission-of-adoption-and-order
http://www.50statelegalforms.com/files/form1/form13756.pdf
... though it appears in America, it's only step-parent adoption that can be rescinded.

