“The Other Son’’ is almost too obvious and too inevitable to be real. A nice French-reared, Jewish family in Tel Aviv and a less-well-off Arab quintet discover that their sons were delivered to the wrong clans. Making this drama must have been like discovering the website URL you swore was taken is actually free. The movie, written and directed by Lorraine Lévy, is shameless and simple yet solemnly optimistic at the same time.
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