老公入籍已多年,我绿卡三年,我申请入籍递N-400时，supporting documents 需要 Affidavits sworn to or affirmed by third parties having personal knowledge of the ona fide's of the marital relationship.
请问，这个材料需要公证吗，还是夫妻两人再加第三方签字就可以了？多谢！