Non-immigrant Visa, Undocumented Sister.

It should not have an impact. You can file for your wife now and then inform the USCIS of the status change once your are sworn in as a citizen.

Could SNAP hurt a green card joint sponsor?

Yes, this could have an effect. The sponsor is put in place to insure that the beneficiary (your wife) is not a burden on society by receiving...

When can I apply for I-601 and I-212 waivers

It's not looking good. By returning after being deported he just made the situation worse.

Will miscalculating days outside US affect chance getting approved for citizenship?

It should not have a major impact. It would be a good idea to bring all of the documentation you have available regarding your travel with you to...

Is it possible to change the I-485 processing location from Nebraska to Texas? will it be faster to process if someone does that

What is the reason for your need to expedite the application? You may or may not be eligible to speed up the process.

Generally, no. You can only expedite the I-485 processing in limited situations as described above.

Apply naturalization while greencard renewal is pending in USCIS

I would apply for citizenship as soon as your eligible. The green card renewal should have no impact.

How long can I stay in the US after I quit my job if my L1-B Visa is still valid?

You may want to pursue a visitor visa to use to travel around the US after your employment status changes.

I need an attorney asap; I have to provide a joint sponsorship I864 for my daughter and her South Korean spouse

You need to complete the I-864 as a joint sponsor. Be mindful that this will keep you on the hook financially for your son in-law. There are many...

Immigration related question

Once you are a citizen, you can petition for them to receive a green card. There is also a visitor visa that is good for up to 6 months at a time.