Rav Rokach is the son-in-law of Rav Yitzchak Dovid Horowitz, av beis din and leader of the Ratzfert chassidic kehillah in São Paulo, Brazil. “One time my father surprised me by showing up at a bris where I was the mohel,” Reb Aharon recalls. “A Jewish baby is a Jewish baby, and a baby born from a Jewish mother in Siberia needs a bris just like any baby born in Meah Shearim. Rav Rokach tells the story casually, as though it were no sacrifice, but simply another ordinary episode in the life he’s chosen. “When I heard the avreich speaking to Reb Hillel,” Rav Rokach recalls, “I asked him to send regards from me.