What is the difference between employed and self employed as a babysitter?

I was hired by a family i know. They have me working a regular schedule. I got paid over 3,000 last year. Not contracted tho. I work from my house and their house. They provide the food for their kids I just watch and entertain them. The parents pick the schedule and this is my only job, my only source of income. Am I an employee or self employed?