你给你爸办绿卡只需要证明你爸是你爸

不需要证明你爸是你妈的老公

这个还挺复杂，查了一下I-130表的说明，如果没有最原始的证件，新的结婚证的日期要在你满18岁之前才可以，或者要证明在18岁前有抚养关系，再退一步要证明在你满21岁之前有父子抚养关系（比如同住，经济支持，情感支持）才可以。同样适用于继父继母，养父养母的情况，

原文如下：

Item G. A father: Submit a copy of your birth certificate showing the names of both parents. Also submit a copy of your parents’ marriage certificate establishing that your father was married to your mother. If either your mother or father were previously married, submit copies of documents showing that each of the prior marriages was legally terminated. If you are filing for a stepparent or adoptive parent, or if you are filing for your father and you were born out of wedlock, see Items D., H., and I. in these Instructions for additional information on proving your family relationship

Item D. A child born out of wedlock and you are the father: Submit evidence that you and the mother were married while the child was under 18 years of age, or submit evidence that the child was legitimated under the law of the child’s residence or domicile, or under the law of your residence or domicile, before the child reached 18 years of age. If your child was not legitimated before reaching 18 years of age, you must file your petition with copies of evidence that a bona fide parent-child relationship existed between you and the child before the child reached 21 years of age. This may include evidence that you lived with the child, supported him or her, or otherwise showed continuing parental interest in the child’s welfare.

Item H. 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 turned 18 years of age, copies of documents showing that any prior marriages were legally terminated (if applicable), and a copy of the stepchild’s birth certificate.

Item I. 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 showing that the adoption took place before the child turned 16 years of age. If you adopted a child under 16 years of age, and you also adopted the older sibling of that child, you may file a petition for the older child if the adoption occurred before the older child turned 18 years of age. You must submit a copy of the adoption decree showing that the adoption of the sibling occurred before the sibling turned 18 years of age. In either case, you must also submit copies of evidence that each child was in the legal custody of and resided with the parents who adopted him or her for at least two years before or after adoption. Only a court or recognized government entity may grant legal custody, and it is usually granted at the time the adoption is finalized. However, if legal custody is granted by a court or recognized government entity prior to the adoption, that time may count toward fulfilling the 2-year legal custody requirement.

如果没法证明第一次结婚时有结婚证，相当于出生时母亲还没有结婚（you were born out of wedlock）

if you are filing for your father and you were born out of wedlock, see Items D., H., and I