You can deduct medical expenses for your self, your spouse, your dependents, and someone who qualifies a your dependent except for the income test. The details are in publication 502, but the short answer is that you can deduct medical expenses for your parent if you pay more than half your parent's support costs (housing, food, travel, medical expenses, etc.). It doesn't matter what your parent's own income is or where they live, but you must pay more than half their overall cost of living.
Then, medical expenses you can deduct include travel for the sick person plus one caregiver who accompanies them, if it is necessary to travel to obtain medical care. Unfortunately, your own disrupted daily living expenses are not a deductible medical expense.
https://www.irs.gov/pub/irs-pdf/p502.pdf
