Can I submit an application for my brother in Guatemala even if my mother has already put in an application?

Yes you may do so. In your application disclose it that someone i.e your mom has already filed an application for him.

Can I file I-751 without an attorney and do I need to include disposition regarding arrest by immigration?

As advised by other attorneys here there is no requirement to have an attorney to do this. However it is advisable to get professional help now...

I m looking for experienced immigration attorney

In 1995 you would have been still a minor regardless of which date of birth was used to apply for an immigration benefit for you. Unless there are...

Will it affect anything?

With MAVNI you get direct citizenship. DV does not give you that. But there is no harm in applying for both. ...

If you have been paroled into the U.S. under the Cuban Family Reunification Parole program, what is the category used on I-765?

You have to be paroled as a refugee to apply for EAD under a(4). But I believe the CFRP parole program falls within a(11).

How can I get back the money from a seizure to forfeiture of my bank account?

You dont have to be accepted as an immigrant to be accused of immigration fraud if you have an application for an immigration benefit pending. ....

What is the best way, in this case, to be in the United States legally?

There are some good possibilities for her. Consult with an immigration attorney of your choice. lawyers on Avvo cannot offer their services here...

Each individual applicant must receive their own letter to be effective..................................................

Does it matter which office you choose to file your i90 or N400? What about not filing the i90?

It is advisable to file where you live. I agree with other lawyers. Follow instructions on form N400 it will tell you where to file it.

What should i do i need an advise

I am so sorry to hear about this problem you are having. Its a tough situation no doubt about it. however this kind of case and situation cannot...