For a while, I basically became my dad’s food-and-meds supervisor. I made him check in three times a day—photo proof of every meal—and he had to do the same with his blood pressure pills, morning and night.

Then one day, the housekeeper called and told me to pick up more blood pressure meds for my dad on my way home.

On the phone, she said, “Zee, can you buy Sir Rogers some blood pressure medicine when you’re coming back? He hasn’t taken it for three ...