Wait until after your F-1 is approved. Remember that Immgrating through your sister could take 11-23 years.
Mr. Shusterman is a former INS Trial Attorney (1976-82) with over 35 years of immigration experience. His response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.
If your sister files for you or if you intend to immigrate here, your F-1 may not be approved.
Ismail T. Shahtakhtinski, Esq.
I.S. Law Firm, PLLC
1199 N Fairfax Street, Suite 702
Alexandria, VA 22314
The information provided in this answer is designed to provide useful information and background materials about I.S. LAW FIRM, PLLC. The information provided is not intended to and does not constitute legal advice, and does not create an attorney-client relationship between you and I.S. LAW FIRM, PLLC. Any communication, including electronic mail, through this website may not be confidential or privileged. For legal advice, you should consult with an attorney familiar with your circumstances and seek the advice of counsel in the appropriate jurisdiction. The hiring of an attorney is an important decision and should not be based upon written descriptions of I.S. LAW FIRM, PLLC’s experience. Every case is different and similar results may not be obtained in your case. I.S. LAW FIRM, PLLC does not endorse or sponsor any links from this website to other websites and has not reviewed and does not accept responsibility for their contents.
Be careful, very careful.
Talk to a lawyer, unless your sister filed more than 10 years ago for you, her petition won't help and could hurt a F application.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.