An Affidavit is a legal document in which someone makes an oath. http://en.wikipedia.org/wiki/Affidavit
It it a common part of evidence to supply proving a bona fide relationship / marriage. In most cases it will need to be signed by the person making the oath in front of a Notary.
Below you will find a template for an affidavit attesting to the bona fide nature of a relationship, there is one for the USC spouse, and one for a third party.
It is not always necessary to supply Affidavits with your I-129F/I-130 Petition, but it can be a common request in an RFE.
Spousal Affidavit
[TOWN/CITY] [COUNTRY]
In re application for a Visa for the United States of America Evidence in support of a bona fide marriage between [NAME] Applicant, and [NAME], Beneficiary
AFFIRMATION OF [NAME]
[NAME], being duly sworn, deposes and says:
1. I am making this affirmation in connection with the application of my wife, [NAME], for a Visa for the United States of America. The contents of the affirmation are based on my own knowledge and are true.
2. I was born on [DATE] in [CITY, STATE].
3. My present address is [FULL ADDRESS].
4. I am the husband of [NAME].
5. I am a United States Citizen and I have submitted an I-130 petition for my spouse, [NAME], in order to obtain Legal Permanent Resident status.
6. In chronological order, the details of our marriage are as follows:
[HOW WE MET]
[HOW OUR RELATIONSHIP DEVELOPED]
[HOW WE DECIDED TO GET MARRIED]
7. Our marriage is a bona fide marriage, and neither [NAME] nor I entered into it for any immigration-related purpose.
8. Our marriage was, is, and continues to be viable.
_________________________ [NAME]
Sworn before me this _______ day of _______, 2008
_________________________
Third Party Affidavit
[TOWN] [COUNTY] [COUNTRY]
In re application for a Visa for the United States of America
Evidence in support of a bona fide marriage between [NAME], Applicant, and [NAME], Beneficiary
AFFIRMATION OF [NAME]
[NAME], being duly sworn, deposes and says:
1. I am making this affirmation in connection with the application of [NAME] for a Visa for the United States of America. The contents of the affirmation are based on my own knowledge and are true.
2. I was born on [DATE] in [TOWN, COUNTY, COUNTRY].
3. My address is [TOWN, COUNTY, COUNTRY].
4. [NAME], the beneficiary, is my daughter.
5. [WHEN THRID PARTY FIRST MET / BECAMAE AWARE OF RELATIONSHIP OF PETITIONER AND BENEFICARY]
6. [OTHER OCCASIONS THRID PARTY HAS WITNESSED FIRST HAND, WHICH CONFIRMS THE RELATIONSHIP IS GENUINE]
7. I have visited [NAMES] in their home in [PLACE], and found them a very happy couple and obviously in love.
8. I was a witness at [NAMES]wedding on [DATE].
9. I have personal knowledge of the bona fide of [NAMES] relationship. Their marriage is legitimate, viable, and not entered into for any immigration-related purpose.
_________________________
[NAME
Sworn before me this _______ day of _______, 2008
_________________________
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NOTE: The above information does not address the specific requirements for any given case and is not a substitute for the advice of an attorney.