Why do fathers have to bring A copy of your parents? civil marriage certificate?

[Lumanachi]

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[newacct]

I don't know if I'm on the write post. well, anyways according to (https://www.uscis.gov/family/family-...nent-residents) it say

father lives outside the United States,Then must submit...

Form I-130
A copy of your birth certificate showing your name and the names of both parents
A copy of your Certificate of Naturalization or Citizenship or U.S. passport if you were not born in the United States
A copy of your parents? civil marriage certificate

I just wandering why only the father has to bring a copy of you parents civil marriage certificate? or is it for both?

I want to bring my father to the USA, but just wondering about that

Yes, a marriage certificate of the parents is required to prove a father-child relationship, but not a mother-child relationship.

For a parent-child relationship to count for immigration purposes, either the child must be born in wedlock, or must have been legitimated under the state's law (due to the parents' subsequent marriage or other legal reason), or there must have been a bona fide relationship between the parent and the child before the child turned 21.

For a mother-child relationship, the child is always considered "legitimate" even if born out of wedlock, so only the child's birth certificate is required.

For a father-child relationship, if the child was born in wedlock, then the child's birth certificate and the parents' marriage certificate (showing a marriage at the time of the child's birth) is needed. If the child was born out of wedlock, but was legitimated under the state's law, then the child's birth certificate plus the parents' later marriage certificate, or evidence of other legitimation, is needed. If the child was born out of wedlock and was never legitimated, then evidence that a bona fide father-child relationship existed prior to the child turning 21, is needed.