How to prove ex wife is using child support for illegal immigrant??

I guess that would be a question for your Family law attorney.

DO I NEED TO BE WORKING TO HELP MY HUSBAND BECOME A RESIDENT?

You have to have a certain income or assets to show he would not become a public burden. If you do not have that, you need to find a joint sponsor.

Will I be able to port my priority date if i switch my employer after i140 approval and current & new Job description mismatch

The question of the "same" or similar occupation is a legal question. your new employer's Immigration attorney would help you with that.

Do I need a re-stamping and what I-94 will be applicable in my case?

You have to present these questions to your attorney. There is a lawyer who processed your paperwork, and he/she is in the best position to answer...

What kind of public benefits a VAWA recipient can apply for ? With no harm in the adjustment process?

VAWA dependents may become a public charge. It means you can apply for any state benefits you may qualify for. You can check this in a local social...

What do I need to do for my wife hasgreen card holder and I am a citizen but going for a five years missionary work. Can she go

I am not sure if your work would qualify for an exception, but in any event, your wife should apply for a reentry permit. It is valid for 2 years,...

Change of Status from H1B to B1/B2

Yes, you can apply. The odds depend on many different factors, including your explanation of why you wish to remain in the US. It usually takes...

If I am suspended on F-1 visa, and I have B1/B2 visa also, then can I go to some other country and come back on B1/B2?

In theory, yes. You may get back to the US in a different status pursuant to a different, valid visa.

Can I develop a mobile app and market it when I am on H-1B Visa? How do I protect my idea?

Probably yes, but you need to do it correctly as you cannot be self-employed.

Yes is your answer. Your father might need a waiver to get into the US. you should consult with an attorney as to what to put there exactly.