Primary Documentation
Birth Certificate issued by State government or Consulate abroad
Unexpired Passport
Certificate of Citizenship
Certificate of Naturalization
Civil Marriage Certificate
Divorce Decree
Notarized Name Change Certificate

Secondary Documentation
Baptismal certificate, with the seal of church, showing the date and place of birth in the United States and the date of baptism.
Affidavits sworn by persons who are familiar with the events of birth of the petitioner
School records (preferably from the first school) showing the date of admission to the school, the child’s date and place of birth, and the names and places of birth of the child’s parents.
Census records
Military proof

Proof of the relationship
Different documents should be submitted depending on the relationship involved in the petition:
Siblings with same parents
Birth Certificate of the siblings
Household Registration
Marriage Certificate of the parents
A copy of any divorce decrees, death certificates, or annulment decrees that establish the termination of any prior marriages entered into by either of the parents
Marriage Certificate of sisters

Siblings with the same mother
Birth Certificate of the siblings
Household Registration
Marriage Certificate of a married sister

Siblings with the same father
Birth Certificate of the siblings
Household Registration
Marriage certificate of the applicant’s natural father with each mother
Proof of termination of the prior marriages of the father and each mother, such as divorce decrees, death certificates, or other documentation
Marriage Certificate of a married sister

Siblings born out of wedlock
The child’s birth certificate. If the child’s name differs from the name on his or her birth certificate, evidence of the name change must be submitted.
Household Registration
Evidence that a bona fide parent-child relationship is or has been established while the child is unmarried and under 21 years old, or the child has been “legitimated” under the law of the child’s residence before the child’s 18th birthday and the father has legal custody of the child
Evidence that a bona fide parent-child relationship is or has been established while the child is unmarried and under 21 years old, or the child has been “legitimated” under the law of the father’s residence before the child’s 18th birthday and the father has legal custody of the child
Money Order Receipts
Canceled checks
Income Tax Returns
Medical or insurance records
School records
Correspondence between the father and child
Notarized affidavits from friends, neighbors, school officials or other close family members, making proof for the sibling relationship
Marriage Certificate of a married sister