It was sometimes difficult to tell where she ended and I began. My mother was the one to remind us. To parse the differences in our personalities: Leah’s, obsessive and extreme, focused on animals, sports, the great beyond. And mine: scared sometimes, sometimes needy, but happy with the safety of my world, the best friend I shared it with, the mother who pointed out our diverging bodies like she was trying to warn us we would someday grow apart. Which, of course, we did.