H1B Termination in 3 weeks. How long do I have to find new employer?

There is no grace period as your status ends on the last day of work.

Other options for non-Availability of Birth Certificate.

You will need 2 affidavits and a non-availability certificate from the municipality she was born in.

Does my father's new wife wife and child fall under his petition?

No, your father's wife & child do not get derivative status based on your petitioning on his behalf.

Applying for Business visa and will also be travelling as a Tourist

She should state her intent or purpose of visit, honestly, upon entry.

Stamping needed if transferred from L1B (employer A) to H1B (employer B) if I-94 and stamped L1B visa valid until August 2015?

If you leave the US, you will need an H-1 visa to re-enter.

Why I donnot received any mail about i130 case after. First receipt mail?i have

you can call USCIS at 800 375 5283 and they maybe able to send you a duplicate.

If pending petition of extension get abandoned because of going outside then after coming back US can i file for extension again

Talk to your attorney, he may recommend conversion to premium processing - so that when you leave you can come back on the old visa & show your new...

The Attorney filed my son in law's I130 incorrectly and now he is out of status.

You should meet with an attorney, since the answer you received is correct but your son-in-law may have a status maintenance issue and questions...

This is long wait, but not unusual. You should either keep following up with the local or retain an attorney to do that for you.

I-485

Depending on the basis for the I-485 and the importance of the missing document(s), either the application will be rejected, or an RFE will issue...