Length of stay for Canadian in Usa for compassionate reason? My sister recently underwent major surgery for abdominal & ovarian cancer. She requires constant assistance for all everyday functions. I am the only relative able to give her this help. With upcoming chemotherapy &possible radiation treatments I fear that I may have to stay in the USA for longer than 6 month. My normal residence is in Ontario, Canada & my sister resides in Florida. Is there anyway THAT I CAN EXTEND MY STAY FOR LONGER THAN NORMALLY PERMITTED ?