A huge blow to my world

My grandmother on my mother's side was dying, so I flew back out to Ohio to see her. She was feeble, but still mentally present, despite all the drugs. I sat next to her hospital bed and we talked about the good old days. At one point she grabbed my hand and said she had something important to tell me. "You were adopted," she said, and went on to explain how my mother and father had adopted me because they didn't think they could have kids. My crazy younger brother was an accident, exactly what they had feared. It devastated me, but also made some sense.