On a winter day eighteen months ago, Mohammed and his family, from Aleppo province, stood awkwardly in front of a makeshift outdoors photography studio set up at a refugee camp in Lebanon’s Bekaa Valle
Mohammed’s wife held their newest baby and the two stood behind four chairs – one each for their two older daughters and two sons. One remained empty, representing their missing 21-year-old eldest, Reem. 
She was separated from the family on her wedding night in 2013, when the region was being bombed by Syrian government forces; the family never knew what happened to her.
Their lips are pursed thinly as they pose next to a physical reminder of their loss.
The haunting series of photographs of refugee families by Italian Dario Mitidieri was part of a campaign by Cafod and creative agency M&C Saatchi which drew the world’s attention to the plight of Lebanon’s estimated 1.5 million refugees; families posed for portraits with spaces …