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Mark pulled out his phone. "Her name's Casey. She's almost four." He looked at the image on the screen for a long moment, his mouth twisted into a crooked smile. "Your half sister."
I took the phone from him and stared at the photo. A round-faced girl, smiling, with short dark hair and big eyes. My stomach was full of something much squirmier than butterflies, and my throat was getting all tight.
"Must be hard to be away from her," Mom said.
"It is," Mark said. His voice sounded funny, like he really meant it. Like he could hardly stand to be away from his precious little girl.
I sucked on my bottom lip. He'd been away from me, his other daughter, for my whole life and he hadn't cared at all.