I didn't even know I had a sister until my mom broke down and told me. She had given birth to my sister when she was barely 15, and gave her up for adoption.
She said she would have told me when I was younger, but she didn't know if it would have been good for me. I wondered oddly why she had chosen now to tell me. That was when I realized what she wanted me to do.
The doctors had already told her she needed a bone marrow donor, and my blood wasn't a match. She was hoping that I would go and find my sister and possibly the chance for my mom to keep her life for a little while longer.