I need you right now. Me for what. My big sister needed me.I was 17 and she was 20. You know, Katie told me she needed me when she had brain cancer. About a year into her diagnosis, my brother and I were headed out the door to get ice cream.When she asked to go, I said yes, but this wasn't my best day as a caregiver. I slipped and I was tired and showed on my face that I was reluctant to bring her. In that moment, uh, I was balancing supporting my terminally ill sister and my own youth mental health.You kno ...