Will i immediately be Out of Status if my current Employer cancels my H1B?

If you join your new employer, you will continue to maintain status.

Quitting sponsoring employer within 3 months of acquiring residency may raise a red flag. However much also depends on when you joined the...

I'm not sure I understand which visa expired?

Do i need to entry in different port of entry every time i would like to enter in USA? Help me plz to go usa again w/o any quest

Visiting U.S. every two years without prior overstay issues should not be a problem.

Is premium processing (i907) allowed for change of status from B2 to H4 (i539) ?

Not if this is the only application to be filed. Yes, if it will be filed along with H-1B petition.

My Wife Having H4 visa valid till september 2015 and she also having H1 visa from her employer till September 2014.

1) H-1B overriding H-4 visa? A visa is valid until voided or canceled by the Consulate. 2) One can have multiple visas on one's passport which do...

Can my daughter,son in law, and my brother all US citizen file affidavit of support for my 12 year old daughter?

Yes, you may seek co-sponsorship towards your daughter's filings.

My H1b extention was denied and MTR is filed. My I94 is already expired. My wife is in F1 status. Can i file F2 now?

You may want to provide dates as to the events and consult with an experienced immigration attorney.

If your spouse is granted residency after the second year anniversary, it will be a permanent green card.

If my mother leave the country, Would I still be able to get her a green card?

If she leaves, she is barred from entering the U.S. for 10 years. She may qualify for a waiver. It is best to work with an attorney for guidance.