Companion Care Needed For My Father In Providence

About who needs care: My father is 90 and has limited mobility (he uses a walker) due to back pain. He spends almost all day sitting comfortably in a lift chair and doing crosswords or emailing and only gets up to get himself to the bathroom (which is rigged to help him). We are looking for someone to just be in the house 2 days a week for several hours so that my step mother can get out to do errands or have lunch with a friend or go to a movie and not worry about him. The only real responsibility would be to make him a sandwich for lunch on those days! Otherwise, being in the house in case he needs help. He is not a conversationalist and would rather be left to himself so the job is light on interaction! Services needed include: meal preparation, errands / shopping, light housekeeping, and companionship.