Relatives of hostages in Gaza say they feel the absence of their loved ones acutely during Passover, which commemorates the Exodus of the Israelites from Egypt and their liberation from slavery. Jews around the world will mark the beginning of the weeklong holiday Saturday night, gathering for a meal called a Seder that features symbolic foods and rituals to help recount a biblical story about bitter times, a flight from tyranny and, eventually, freedom. In Israel, the second Passover since Hamas’ Oct. 7, 2023, deadly attack stirs up a mix of complicated emotions — especially for those whose family members are among the 59 still in captivity in Gaza.