Family-Based Green Cards

I am a US citizen and would like to sponsor green card for my parents once they arrive here. I have couple of questions related to that. 1) My mother’s birth certificate contains name before marriage, is this going to be an issue? Her passport contains her name after marriage. Her mother and father expired long time back, and she is the eldest daughter. 2) My parents does not have marriage certificate with them what are the options. They cannot go their original place to get the marriage certificate 3) My father does not have birth certificate but has College degree/certificates mentioning his date of birth. Will this suffice the requirement, if not what are the options he has? Again he is not in a position to go to his birth place nor is he in position to take help from his elders to give affidavit for him. His mother and father passed away long time back.

My sister is a naturalized US citizen and she is planning on applying for my GC. I have 2 questions:
1. If my company decides to sponsor my L1-A visa (after my GC application is submitted) will my L1-A be denied because of my GC application?. I have a multiple entry 10 year tourist visa that will expire in 2017. If I apply for a new tourist visa in 2017, will that be denied?
2. Furthermore, my father's GC (consular processing) is being processed currently. Once he becomes a GC holder, can he apply for my GC (I am single over 21 years of age) in such cases Processing time is also much less. If my father can sponsor my GC, what happens to my application in the unfortunate event of my father's demise during this period?

I am US citizen and planning to sponsor green card for my sibling. My sibling has already visited US in B-1/B-2 visa few times and holds that visa for another few years.
I know that this kind of application takes 10+ years to approve. From this context in mind, I have few questions -<br>

1) Can my sibling enter United States on the same B-1/B-2 visa after I apply immigration application?<br>
2) Can my sibling apply for renewal or new B-1/B-2/H-1 visa while application is being processed?

I am a US Permanent Resident from Nepal. My girlfriend (soon to be wife) is a student doing her MBA and is in F-1 visa (student). She is graduating in May 2015 and will start her OPT soon after that.
We are planning to get court married real soon (within a month) and file for her green card soon after that. Once she gets her green card, we'll go home and get married with all the religious ceremonies. <p>

I had few questions about the green card process for my wife. I looked through various threads of various forums and I am more confused than before on how exactly this process works. I got conflicting answers for these questions. So, I am posting these questions so that I could get the correct answers from the expect himself.
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I understand that for my wife's GC, first I need to petition I-130 and she needs to wait until her priority date becomes current (which the people say can take several years to be current), then she needs to apply for Adjustment of Status. <p>

1. Could you go briefly on the whole process from start to finish? <br>
2. Some of the threads on the other forums said that the Congress changed the law so that there is no wait time for Spouse of Permanent Resident to apply for her green card. How much truth is in this statement? <br>
3. Some people who applied about a year or two ago said that they got their GC on hand within 6 months. How is that even possible when the wait time to just apply for GC under this category is several years? <br>
4. What happens if she applies before her priority date becomes current? Will her application be denied or will it just sit in a queue (first come first serve) until the priority date becomes current and then it will get processed? <br>
5. If she starts her OPT in May 2015 and the OPT lasts for 1 year (till May 2016), would that be enough time for her to apply for GC through my petition?

Need your esteemed advice for my mother (75 years old, sick and disabled). We are only two sons and our father passed away last year. We have nobody back in Pakistan who can keep her and look after her. My brother lives in UK. I am living and working in USA (on EB-2 green card). My mother had been refused UK visa twice as she has no sufficient family ties to home country (Pakistan). I received my green card in April 2011 therefore I have some time still remaining to apply for my US Citizenship (January 2016) and then sponsor her. <p>

My mother B-1/B-2 visa is expiring in August 2015 and keeping in view her long frequent trips to US (she always departed before I-94 expiry, no overstays) and insufficient family ties to home country (Pakistan) her B-1/B-2 re-stamping seems very hard.
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Can you please advice what can be done here? What are the options to keep her with us in US?