I also found this looking through the forums so I may just use this. I cant post urls so I am posting the content
The affidavit letter do not have to be notarized but I think it is best to do it. I will sent my I-751 in 2 week.
Here something may help you.
Things you need to include on the affidavit:
• Person's full name, address and perhaps telephone.
• Their relation to you (friend, co-worker, neighbor, relative, etc)
• Length of knowing you (you-guys)
• How often seen/visited
• Perhaps, last occasion of visit.
• Perhaps a brief personal statement (whatever that may be, depends on the person).
AFFIDAVIT OF PERSONAL RELATIONSHIP
I, __________, residing at _______________________________________,
Being duly sworn depose and say,
1. That I was born on _____________ at ______________.
2. That I am ____ years of age and have resided in the U.S. since _______.
3. That this affidavit is being submitted on behalf of the following persons:
____________________ & __________________
4. That this affidavit is being made by me for the purpose of assuring the U.S. government that the persons named in item 3 have a true and loving relationship that was entered in "good faith," and is not for the purpose of circumventing immigration laws.
5. That I acquired my knowledge of the relationship between the persons named in item 3 in the following manner:
__________________________________________________ ________
__________________________________________________ ________
__________________________________________________ ________
__________________________________________________ ________
__________________________________________________ ________
__________________________________________________ ________
__________________________________________________ ________
OATH OR AFFIRMATION
I swear (affirm) that the contents of this affidavit are true and correct to the best of my knowledge.
Signature of person making this affidavit: _______________________________
I am doing my application by myself.