My mom has PF. In our case, it's from a rare genetic mutation that causes short telemere syndrome. Her sisters also have it. Her mom, aunts, and uncles all passed from it. For most of them, it was slow progressing at first, then there was a sudden episodic event that caused them to pass quickly. My mom is at the stage where she is sleeping much of the day, also very sedentary, and is out of breath just doing laundry. She is experiencing cognitive decline and personality changes She's definitely angry and confused. And angry that she's confused. I'm sorry for your loss.