I believe that all adopted children have the right to know who their biological parents are. Learning who their biological parents are, give them a chance to learn about their ethnicity, family history, and connect to their roots.
stimmel-law.com:
"Medical and psychological information of the birth parents may be given to a state registry any time after the adoption. The information is important to adoptees because it can indicate if they have a higher risk of some diseases."
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Adoption.com:
"Every adoptee should have access to his or her birth certificate. Adoptees have a right to know where they come from and who their biological parents are. Period. Not only is it their right, it is a basic human right."
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Adoption.org:
"No adoptee should ever feel like there is an obligation to reunite or meet with their birth family. Each adoptee has his or her own unique journey. Only that person knows what is best. With the ever-growing popularity of DNA testing for adoptees, one might feel pressure to join in
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Scie.org.uk:
"Children who have direct contact with birth parents usually already have a good attachment to them, which precedes their placement and because of this they may be better adjusted, more likely to experience a stable placement and more likely to go home to their parents."