”Fortunately, I had a big sister who believed in me and who was quite willing to strong-arm me, for which I am very grateful.” — In April 2022, I spoke with Natalia and Lauren O’Hara, the writer and illustrator, respectively, of a series of children’s picture books, for Working, Slate’s podcast about the creative process. Their books include Hortense and the Shadow and The Bandit Queen. We talked about how the sisters came to collaborate…