You can submit the letter to USCIS investigations. It is not at all likely that this is sufficient evidence to revoke his permanent residence.

Citizenship

After five years permanent residence, one may be eligible to file for U.S. citizenship.

Acquired citizenship by naturalization or not?

No, if she never adjusted to permanent residency she does not become a derivative citizen. Yes, she can adjust to permanent residency based on...

Are my parent eligible to be petitioned for US citizenship if they are here illegally by overstaying on a tourist visa?

Yes, you can file for them. Bankruptcy will not make your father ineligible.

The father of my 2 daughters was deported april2010 he reentered may 2011 was caught and sentence for 6 months in fedral custudy

Yes, depending on the grounds of his deportation, after either 10 or 20 years, you will be able to file a petition for him, if you get married, and...

What happens when I (a Canadian citizen who is a permanent resident in USA) marry an American Citizen?

Marriage will not change your status. You can contact a Canadian immigration attorney to determine whether marriage to a U.S. citizen will cause...

You will be responsible to support your friend for the rest of your life, if he chooses not to work. You are not responsible for his debts, though.

Overstayed J2 Visa, is it possible to find an employer to sponsor a greencard?

You must return to your country for two years, it is not sufficient for the J1 to return for two years, you also must do so. Since you were...

Green Card Holder stayed outside USA for around 9 months and wants to come back to USA within less than a year?

Your father will need proof of the reason for his delay inreturning to the U.S. Your resident status does not depend on whether or not your father...

How long does it take to get a decision on a I130 RFE more information was sent

Once there is a request for evidence, the case goes into slow motion. It depends on what the request was, and what your response was to the request.