If both you and your dad are already here in Canada as PRs, she cannot decide to stop sponsoring you. She has already sponsored you. If your father leaves the home, and they break up, then his PR might be taken away (if he had Condition 51 on his PR card). If he has Condition 51, then he and the sponsor have to live together for two years after he becomes a PR. If he does not have Condition 51, then he is a PR and his wife cannot take that away.