The persons seeking the visitor visa need to make the application. Yes they may reapply, however, 6 months is a good rule of thump to wait. Once...

My brother filed I-130 for me only as famiy member and during the process I added my family. Should he fill I864EZ or I864?

All persons being sponsored will need to be covered. Follow the form instructions closey to determine the proper for and information required.

I am on H1b, my employment is ending in end of june. My I140 is approved. what are the options to stay here. Can I switch to F1?

It is unlikely a change of status to F-1 will be granted timely to meet your needs but it is possible.

How do international custody laws work?

It should have no impact on eligibility to obtain resident status with the possible exception of the amount needed for the affidavit of support if...

There are options for having the conditions removed for persons that entered into the marriage in good faith. Contact an immigration attorney...

Can i have case terminated or apply for voluntary departure on my own or do i need to hire an attorney?

It is permitted but not recommended.

Can my mother now revisit USA on visit visa after staying in usa(nov2015-oct2016) for 1 year and then 8 months in India

If she has a valid visa passport and did not incur a bar from overstaying, probably yes.

What are my options to change from H4 to H1 visa when my employer refuses to give me I129 copy?

The H-1B petition is the employer's and the receipts for the petition belong to the employer. You can try a FOIA .

Does the money that I get from my parents count towards my income even though I'm unemployed in the US when filing the i-864?

For qualifying income from the beneficiary see the instructions to the form I-864.

I'm filling i485, in part 3a for mother's first name does it goes just the first name or the full name including last/middle?

The question should be answered with the full name as asked. Your father should be included.