Can I use my I-140/I-485 based Empl Auth Card to work for an employer other than petitioning while waiting for I-485 approval?

Your employer has a lawyer who filed your petitions, utilize him or her for your immigration concerns. Goodluck

You may not work on a visitor's visa Goodluck

Have you ever been refused a U.S visa?

Best to speak to your brother about the previous application. However, if she has been refused be candid with your answers. Goodluck.

How to disclose traffic and criminal on form N-400?

See my previous answer, Take the certified court dispositions to your interview Goodluck

How to disclose criminal traffic on form N-400?

You must answer all questions accurately on the form. If it asks for explanations then explain and take the court dispositions to the...

A legal resident relative with felony charges agreed not to fight the deportation process, a friend can get a ticket for him..

Contact his deportation officer to confirm the arrangement. Goodluck.

Beat to correct before any questions starts at the interview. Goodluck.

Finace visa?

Speak to a lawyer about the requirements for a fiance visa or read at uscis,gov Goodluck.

Is it permissible for me to adjust my status with a valid visitors visa?

You can, but you must be in valid immigration status during the whole process, and thus the CP is more a more desirable route. Contact an...

APPLYING FOR CITIZENSHIP

Yes you have to wait 1 year 9 months more to apply. Goodluck.