Documents to Prove Family Relationship

[RFernandes 0]

Hi,

In research in the site of USCIS (Instructions for I-130, Petition for Alien Relative), I came across the following instructions:

"What Documents Do You Need to Prove Family Relationship?

You have to prove that there is a family relationship between you and your relative. If you are filing for:

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7. A father: Submit a copy of your birth certificate showing the names of both parents. Also give a copy of your parents' marriage certificate establishing that your father was married to your mother before you were born, and copies of documents showing that any prior marriages of either your father or mother were legally terminated. If you are filing for a stepparent or adoptive parent, or if you are filing for your father and were not legitimated before your 18th birthday, also see 4, 8, and 9.

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Question: What will happen with the legalization process, if the American citizen's parents were single to the time of her (my daugther) birth, once it cannot supply the demand of presenting the marriage license with the petition I-130?