TEL AVIV, Israel—An Israeli family asked an appeals court on Thursday to halt the planned return of a 6-year-old boy who survived a cable crash in Italy to his relatives there. There was no immediate ruling in the case surrounding Eitan Biran, who has been at the center of a bitter custody battle between relatives in Italy and Israel. This week, an Italian judge issued an international arrest warrant for the boy’s grandfather, who whisked Eitan to Israel on a private jet in September. Eitan’s parents and younger sibling were among 14 killed in May when a cable car slammed into a mountainside in northern Italy. His maternal grandparents in Israel and his paternal relatives in Italy are both seeking custody. Last month, an Israeli court ordered the boy to be returned to his relatives in Italy, saying that was “the place of his normal residence.” It also ordered his …