A Big Family Of Four

Riddle: I have one sister, a mom, and a dad. Every school morning my mom or my dad is gone, and there are two adults in the house. I never have a babysitter, or anybody pretending to be one of my parents. How is this possible?

Answer: My sister is 18, which is considered an adult. She does not want to go to college, so she is with me every morning!

Source: https://www.riddles.com/6401

I have one sister, a mom, and a dad. Every school morning my mom or my dad is gone, and there are two adults in the house. I never have a babysitter, or anybody pretending to be one of my parents. How is this possible? — A Big Family Of Four by Jokeman27 Riddle