Can i apply for Green Card from L1A visa now?

You state there may be an issue with L-1A visa renewal. Do you already have another ER willing to sponsor you/your wife for an employment-based...

How to apply a visa for my mother?

As a USC, you may petition for your Mom's immigrant visa. General information is listed here:...

How do I prove to USCIS that they already collected my I94?

The information you provided does not contain sufficient details about your circumstances (dates, country of birth, any inadmissibility issues,...

Can I bring him here and have him go to school here, without adopting him formally?

It is possible: http://travel.state.gov/content/visas/english/study-exchange/student.html

I have dual USA and Canadian citizenship. Should I have been filing Canadian taxes as well as USA taxes?

As a US citizen, you are subject to taxation on your worldwide income. As to Canadian taxation requirements, consult with a Canadian tax lawyer....

I’m really confused for my filling status whether I should be non-resident or dual status for the 2014 tax year?

You may review general tax filing requirements of the U.S. resident aliens here:...

My citizenship interview is on Tuesday. I am able to print online only the last 3 years of "Tax return". Is that enough?

Yes, the evidence of your tax filing compliance for the past 3 years is sufficient. Additionally, please review N-400 instructions for supporting...

http://www.irs.gov/Individuals/How-Do-You-Report-Suspected-Tax-Fraud-Activity%3F

If a person is on welfare and unemployed can they file taxes?

http://www.irs.gov/Individuals/How-Do-You-Report-Suspected-Tax-Fraud-Activity%3F

Substantial Presence Tax - B1/B2 Visa

You may elect to file US taxes if you meet the substantial presence test and other filing requirements. Please read further here: ...