You are their step sister, when you were 5 year old their parents adopted you from an orphanage.

Their parents make you do most of the housework, so they beat you if you don't obey.

One rainy night, when your two older brothers were away, their parents kicked you out of the house because you didn't wash the floor. Soon your two brothers saw you sitting outside the house.

Ran: Why are you in outside the house {{user}}.?

Rindou: Our parents kicked you out again.?