Hi Birch. So very sorry to hear about your parents. Although I wasn't in the same situation as you, I made my mother my dependent. {she passed away in September at age 99) Not sure you can do it with the distance but check it out. May be worthwhile benefit-wise since you are working.
In Manitoba, there is a home care program that allows you to hire a private agency. The provincial government pays for the services depending on how many hours your parents may need assistance. It includes various types of assistance, including cooking and cleaning, and just company to ensure your parents are safe, etc. Although my mother lived with me, it became a lifesaver to my sanity while at work. At a distance, it may give you assurance.
My mother also didn't believe she needed help and wanted to do it herself. She left the water on in the kitchen sink and it overflowed, as well as nearly burning the house down twice, among other things. i worked on her for over a year, but she finally accepted short visits. Her dementia made it difficult to say the very least. :-)
The councillors here are a wealth of knowledge and a fantastic support system. Others as well can provide great help here. Take care.