We are a family of three, plus a small dog. Our daughter is 5, loves books, Monster High dolls, and will talk your ear off. At least she's funny!
Night time sitting for a few hours as needed. One parent works evenings a few nights a week and the other parent occasionally has social events, which is when we would need a sitter. It would only ever be for a few hours in the evening and would likely include dinner and bedtime.