Watch Sadisflix. Fiona Humphrey (9 y/o) suffers from Sanfilippo Syndrome, a rare form of MPS that is slowly destroying her abilities and will ultimately kill her. Her mother Catriona suffers from an equally rare kidney disease. Her adolescent sisters Paige and Heather function as parents when their father Randy is working at Cracker Barrel, as the sole source of income. This is a look into their life, and the sacrifices they make to be happy.