Yes, if you don't have the relative certificate Birth certificate can prove that they are your parents. Anyway, you need to have a proof that they are your parents, but it doesn't has to be birth certificate.
【在 s******2 的大作中提到】 : Yes, if you don't have the relative certificate : Birth certificate can prove that they are your parents. : Anyway, you need to have a proof that they are your parents, but it doesn't : has to be birth certificate.