How do you find your biological parents through closed adoption?

Can you answer ShauneeBaby’s question about Adoption?:

my older brother is adopted,he has been since before he was born or whatever. Anyway, he is 17 and it turns out he’s bipolar. When my parents adopted him, it was kind of a closed adoption, they weren’t allowed to know my brothers parents’ last names and stuff. now, since being bipolar is often inherited, is there any way to find your parents through closed adoption without any fees or anything?

Adopting From Kazakhstan

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