You can't claim medical expenses for the part of the year that you were not resident of Canada.
As for whether you can claim your dad's nursing home expenses, you can contact the Canada Revenue Agency (CRA) and confirm it with them.
If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere, you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency
