moise vaval is global orphan's country director and a haitian pastor.while he was helping hundreds of orphans, we learned that he was also looking for his own missing son. eight-year-old jean-mark didn't come home from school after the quake. >> moise vaval: jean-mark is a lovely child, a charming guy. anybody who meets him, man or woman, you fall in love with him. >> pelley: you did something that i think is quite remarkable: you came back to work. >> vaval: we are looking for one, but there are hundreds here to care for. >> pelley: you were looking for one, your son. >> vaval: my son. >> pelley: but there were hundreds here to care for... >> vaval: ...to care for. >> pelley: vaval didn't know whether his boy was dead, injured or lost. we followed his search over the next six weeks, a search common to many thousands of haitians. how is it possible to know how many lost children there are in haiti now? >> marie de la soudiere: the answer is, we don't know. we feel it's upwards of 50,000. >> pelley: 50,000? >> de la soudiere: yeah. >> pelley: marie de la