I believe your sister is PR in canada. people used to sponsor their family which is father, mother and siblings(dependent on parents). But this category is currently paused by CIC and will reopen in 2014 with new rules. However, with new rules sibling has to be 18 years old or less. So in that case I would say, She cannot sponsor you now when category will open in 2014. She can sponsor your father but it would be much tougher than it is now.