The move to Ambergris changed my relationship with Duncan. Before the move, Duncan had been the annoying shadow, the imitator who always had to do what I was already doing. When I started a rock collection at the age of eight, inspired by the exposed granite on the hillside near our house in Stockton, Duncan started one, too, even though he didn’t understand why. No matter how I shooed him away, Duncan had to follow me up the hill. A cautious distance away from my irritated mumblings, he would squat in his wobbly way and run his hand through the pebbles, looking for the shiniest ones. Over time, he would squinch closer and closer, waddling like a duck, until before I knew it we were looking for stones together and my collection became our collection.

When I became entranced by the children’s stories of mammalogist Roger Mandible, Duncan not only stole the books from my room but colored in them and scrawled his name, handwriting as neat as a drunken sailor’s, across many of the pages.

By the time I’d reached the age of fourteen or fifteen, I’d realized he copied me because he loved me and looked up to me. (I didn’t look up to you for long—you stopped growing after you turned fourteen, I believe.)

But by then the death of our father and the move to Ambergris had transformed me into something more than Duncan’s sister. There was something in the connection Dad and Mom had that had energized them both—that had made them both more than they had been alone. Because without Dad, Mom lost, or forgot, how to take care of us. I’m certain if Mom had died instead that Dad would have behaved the same way. He was no more practical than our mother. He was as apt to fall over and stub a toe putting on his pajamas as she was to cut herself chopping up carrots. They shared a general absentmindedness that Duncan and I, looking back on those years as adults, found endearing. Dad searching for the newspaper he held in the crook of his arm. Mom looking for the earrings she’d just put back in the jewelry case. Somehow, together, though, they muddled through and managed to disguise their individual incompetence at the job of parenting.