about my sister

My uncle's daughter wants to come to study in U.S. But she is only 17 years old. So my uncle expects me (F2)and my husband (F1) to be her legal guardians in U.S.A. But we have no Greencard, do we have the legal right to be her guardians? If not, how should we find the one who have the right?Thank you. Urgently waiting for your help.

My uncle's daughter wants to come to study in U.S. But she is only 17 years old. So my uncle expects me (F2)and my husband (F1) to be her legal guardians in U.S.A. But we have no Greencard, do we have the legal right to be her guardians? If not, how should we find the one who have the right?Thank you. Urgently waiting for your help.