Your sister is still very young so can learn a new language. You may also speak your home country language at home I assume or could start speaking it at home. You still must know your home country language. Having started a school in a new language as a teenager it is possible. If you were dependent on 3 incomes to support the family that isn’t necessarily realistic. Your best option is likely for your sister to apply on her own for H&C as soon as possible and application will continue even if removed. She should have really applied on her own once she turned 18 for the best chance of success. Once you are 18 you should apply on your own based on having lived most of your life in Canada and having been in Canada due to your parents’ choices not your own. Proof of studies and concrete plans for your future like further education, good grades in high school, extracurricular activities/ community involvement, etc. would help. Both you and your sister will need to show how you could support yourselves without government help and be prepared to stay without your parents. Without seeing your family's whole immigration history tough to comment on your parents and younger sister. Economic reasons are not typically grounds for H&C. Whether you ever had grounds for asylum may also have an impact. Would suggest hiring a lawyer if possible.We did bring up points about inability to access education as my older sister and I are no longer fluent in the language of our home country. Our skills are comparable to that of a 10 year old. We also brought up the fact that my younger sister can’t speak the language and she’s only ever been in Canada. I am currently 17, will be turning 18 this year. My older sister is 20 years old and will be turning 21 this year. Both my parents, and my older sister, were working before they took their work permit away. My family does not take any government support money, except for the time of Covid.
My family moved to Canada in 2015 and we applied for refugee in 2016. We appealed but got refused so we decided to apply for H&C since we’ve established our lives in Canada by then.