Can my sister be my cosponsor if she is a legal resident?

Yes she can be a cosponsor but you have a timing issue you need address before you start preparing the case.

Any immigration attorney please feel free to answer this question.

It can delay any process, including natz and permanent residence.

Is there a waiting period for a Naturalized Citizen to sponsor Green Card for Wife?

You can start her case immediately.

Can I petition my father while he is visiting with a B2 visa?

You need to consult with an immigration attorney quickly because timing is critical and you should not be discussing this in a public blog. Do NOT...

You will have to demonstrate you have been recognized internationally as one of the best in your field. That means recognition in at least two...

On from I-765 - Are previous H-1B approvals to be submitted when applying for OPT?

An H-1 is not work authorization.

NOIR and waiver simultaneously issued

We would need to see the NOIR and get your immigration history to see if you are eligible for a waiver. If you have an approved VAWA I-360 there...

Can I change my employer while I have filled Motion to Reopen Reconsider (MTRR) for my H1B petition?

You do not have any status to extend/transfer unless the Motion is granted, so , no, you cannot change employers now. I would assume the new...

How do i bring my sister and brother from the philippines to visit in the summer for 2 months

They must apply for a B-2 visitor's visa at the US consulate. More importantly they must convince the Consular Officer that they intend to return...

Does divorce has bad effect on changing status from F2 to F1? how about our situation( live separately and plan to divorce)?

Once you divorce you are no longer in valid status and cannot change status you do not have. That is why you need to file the change of status...