They need to be from people who have personal knowledge of the facts attested to.
You should retain an experienced immigration lawyer to review all the facts, advise you, and handle the case. You can find one through http://www.ailalawyer.com.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
Yes, they need to be notarized since they are under oath (with some exceptions). People making them should personally know the facts they testify to. You need a lawyer.
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depending on the use for the affidavit they may or may not need to be notarized. Generally a notarized affidavit or carry more weight even if not required than an affidavit that is not notarized. Persons that complete affidavits should identify themselves as well as how they know you.
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