I have filed my I 539 can I stay while it is being processed if not completed by my current leave date....?

You are not accruing unlawful presence while your I-539 is being processed. Your approved I-539 will make the time you spent after the expiration...

Can I fight the withholding of my security deposit? Do I have a case?

You may have two claims that I could think of 1. If the letter that you received from her lawyer did not strictly conform to the statute...

How can I reenter the US after Immigration removal order ? I was convicted of narcotic charges in Federal court In 1999 .

If I understand your question correctly, if you were trafficking narcotics, it is sadly very unlikely that you will be allowed to reenter....

The son is too old. Get a K-1 visa for your fiancee, then after she has her green card, she can file a family petition for the son. I am in Miami...