I have an ailing mother (84 years old) who is a Canadian citizen. I brought her into the States in Feb this year. While being with us she has continued to deteriorate. She has no family other than the following. I and my wife are not US citizens nor are we green card holders, but my kids, who are over 21 years of age are US citizens. My mother entered by air and does not have an I-94, however her passport was stamped with an indication of B2. We would like to keep her till her graceful end of life with us. Should I consider filing an I-539 and then what after that is done?