The hunt for three elementary school siblings had a happy ending Monday when two sisters showed up at their uncles house and their brother was found by police in Dyker Heights.The Sinchi kids all attend P.S. 176. Administrators sounded the alarm when the three kids failed to show up. The children?s uncle said the girls appeared at his house a few hours after school started. He says they stayed with him for about 30 minutes before he drove them to school.Meanwhile, police say their brother, Darwin, wandered into a local McDonald?s and was told to leave because he had no money. Police found the boy wandering the streets and took him to school. Police declined to say why the children failed to turn up on time pending an investigation.