Children born to foreign domestic workers are not classified as citizens because Chinese nationality is determined by blood ties. Under the visa regulations governing foreign domestic workers, the government of Hong Kong may award an unconditional stay visa. Many of these children can obtain citizenship in their parents' country of birth. When they are put up for adoption, however, citizenship applications can become challenging. In cases where both adoptive parents are Chinese nationals, the children will likely remain stateless. Applying for Chinese citizenship by naturalisation is only possible for permanent residents of Hong Kong, and an unconditional stay visa does not grant this status.