Being married to a US citizen, by itself, does not qualify a person for an EAD. If you file to adjust your status you can apply for an EAD based...

If your income is too low you will need a joint sponsor.

Yes, you can travel with your spouse to the U.S. when he comes with his immigrant visa.

You may need to provide the arrest records so get copies before you try sealing and destroying them.

Yes, and H4 with a multiple entry visa can travel in and out of the US as often as she wants.

Yes, if she is forced to support you she may not have enough money for her son's college expenses.

If the job offer remains in a specific location, it should be no problem. But you cannot file an I-140 for a job in one location when the intent...

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No, the sponsor does not list himself as a dependent.

No, USCIS will have it. Just bring evidence of his current income.

They should be able to file immediately if you are their biological parent.