You say that your siblings are in med school in the US. Are they at least US permanent residents? Are you? If you have a US green card, then it’s a completely different ball game. Again, I think it’s foolish to pay for a US college when you are likely to get into the best college in Canada, and it will cost you so little, but if you are intent upon going to college in the US, and money is no object, I suggest that you apply for your one early decision school to a school that is just slightly above where you might expect to get into, especially a school that is not need-blind. Probably a school with about a 15% acceptance rate, that is not need-blind. Of course, it would have to be a place that you want to be, too!