Home Is Where the Hart Is (1987)

Nurse and con artist Belle Haimes lives with her dull-witted husband Rex Haimes in the Hart Mansion in British Columbia. There, she cares for the invalid 103 year old Slim Hart, aka Pappy, and his comatose wife Minnie. Fed up with her job, Belle plots the death of old Mrs. Hart and the kidnapping of Old Pappy, but things don't go quite according to plan.