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5. A brother or sister: Submit a copy of your birth certificate and a copy of your brother's or sister's birth certificate showing that you have at least one common parent. If you and your brother or sister have a common father but different mothers, submit copies of the marriage certificates of the father to each mother and copies of documents showing that any prior marriages of either your father or mothers were legally terminated. If you and your brother or sister are related through adoption or through a stepparent, or if you have a common father and either of you were not legitimated before your 18th birthday, see also 8 and 9 below.

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8. Stepparent/Stepchild: If your petition is based on a stepparent-stepchild relationship, you must file your petition with a copy of the marriage certificate of the stepparent to the child's natural parent showing that the marriage occurred before the child's 18th birthday, copies of documents showing that any prior marriages were legally terminated and a copy of the stepchild's birth certificate.
9. Adoptive parent or adopted child: If you and the person you are filing for are related by adoption, you must submit a copy of the adoption decree(s) showing that the adoption took place before the child became 16 years old.