What are my options? Where do I begin? Possible scenarios?

Take your attorney's advice and work with a criminal attorney. Any success you have starts there.

What will be the average process time frame for this case of immigration?

Assuming you get married it takes about two years after that. Since he is not filing under the VWP, what it will do is irrelevant in his case.

How to bring my fiance to USA ?

It all starts with the reason for the denials. Time to get an immigration attorney involved.

Can my spouse fill up the DS 160 form without filling the status column of his sister only just mentioning name and her surname

While it is important to answer all the questions truthfully and completely, if you don't know the answer, say so.

How long does it usually take for a warrant of removal order to be executed? How much time do I have before the sheriff comes?

Because this is not an immigration question I have redirected it to lawsuits and dispute forum.

Will this prevent me from getting my wife a visa

No it will have no impact on your spouse's application. She has to prove her good moral character but not you.

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Green card through marriage?

No 10 year penalty provided he has not left the US and returned. You do not state your status, but if you are a citizen you can file for him...

Can I move to Canada with my current status?

DACA is not an immigration status. It is only a temporary deferral of being in the US illegally. You can marry your spouse where ever you want/can....

If I apply for US student visa ,Will it be rejected on the ground that my mother's form I 130 has been filed by my grandmother?

It should not as they are unrelated events.

We are Green Card holders and completed 5 years of permanent residency. Can only one spouse apply for citizenship?

You may apply independent of your spouse and your child will gain citizenship as well.

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