I asked two close friends to do an affidavit supporting our I-751. Their immigration attorney wrote them an e-mail. In it he advises then not to do it and implies there is something strange about our request because my spouse and I obviously are not willing to rely on "primary evidence." We can show joint residence, joint bank account, joint utility bills, etc., and we will. But don't we have to also file an affidavit from two people who have known us and know we are a married couple?