My brother saved my life, and now I must protect him

My brother was only 17 when our parents died and took complete guardianship of my sister and I. At the time my sister was 13 and I 10. I remember when it happened. We were all driving to tour a college my brother was interested in. He was talking about the school’s good science program when my dad checked a notification on his phone and ran a red light through an intersection. A truck T-boned the right side of the car. My mother died on impact, later in the hospital my dad, and although he sat to the right of me, my brother survived with a concussion, broken bones, and a few gnarly scars. I suffered a broken arm and some scars, but without him there, I surely would have died. My sister was the luckiest of us all, she sat to the left of me and only had minor bruising.