ROME—Italian magistrates have issued an international arrest warrant on kidnapping charges for the grandfather of an Israeli boy who was the only survivor of a cable car disaster in May, prosecutors said in a statement on Wednesday. While visiting six-year-old Eitan Biran in Italy in September, his maternal grandfather, Shmuel Peleg, picked him up and brought him back to Israel without the consent of the paternal aunt he was living with, triggering a custody battle between the two families. The boy’s parents, younger brother, and 11 other people died in the cable car crash disaster in northern Italy in May. The arrest warrant targets Peleg as well as Gabriel Abutbul Alon, who allegedly helped him with the plan, the statement said. Magistrates in the northern city of Pavia have asked for the two men to be extradited to Italy once they are arrested, the statement said. Peleg’s lawyer in Italy …