3. No, but you may have difficulty getting it renewed.
4. Probably yes.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
You are asking way too many questions for a free general information blog. Don't you think?
I will not be providing you case specific answers. I find it improper to do so. As a general matter, US citizen sibling can petition, at least true to now, for his or her sibling, a foreigner. The form is I-130 . The waiting time is about 14 years and if granted, the immigrant category includes derivatives which are a spouse and children under the age of 21 on the date the priority becomes current minus the time the I-130 WAS PENDING .
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: email@example.com; Phone: (866) 456-8654; Fax: 212-964-0440; Cell: 212-202-0325. The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter.