I have been waiting since September 2013 for an i751 interview date, is this normal?

It does not hurt to follow up. However long waits for I-751(s) are not unusual.

As long as the marriage is not terminated, you qualify as a spouse and related benefits. If the divorce is finalized prior to the adjustment, you...

How can I apply for Social security number for my child?

Transfers are routine. You may apply for SS# for your child as you will probably need it for tax filing considering there may be a slight delay...

I-130 for mother approved while she was in Thailand. Can she come to US on visitor and apply 1-485 AOS?

Get the green card at the consulate.

Which of these visas are better for future green card application? E2 or L1 ?

L-1A may be the way to go in your case.

Can I get H1 based on I140 Approval?

If you already exhausted your six years in H-1B and cannot adjust per country limits nor are you interested in employment with your I-140 employer...

I was wondering if i could sponsor my mother in Nepal for a green card, I am a US citizen.

Yes, you may start the process by filing an I-130. Look up USCIS website for more information.

My son is arrested for putting paint on the wall of his high school one years ago .can we apply for citizenship for him?

Get a certified copy of the conviction and run it by an immigration attorney before he applies for naturalization.

Impact of DEJ/Diversion during H4 Visa Stamping

She will need a certified copy of her conviction and I recommend running it by an immigration attorney before making travel plans.

Immigration question related to green card and company takeover.

The company's M&A agreement should have a clause to that effect and take over as successor-in-interest.