I recently got my citizenship after 7 years of living alone in Canada. I'm 50 years old. I thought I would be okay by myself until I got diagnosed with breast cancer. Thankfully it was an early stage bc. Done with all my treatments. I'm single never married no children and have no relatives here. So now I'm considering to sponsor my niece who is 17 years old. Although her mom who is my sister is in London UK. She is fine with this as she has another child a son 21 years old. My sister is separated from her husband. My niece and nephew are in the Philippines. Questions: 1. Would I be able to sponsor my sister instead and have her children as her dependents? 2.Or I can only have my niece? 3. Is my nephew too old to be included? He just turned 21. Thank you for future feedback!