HOUSTON The niece of a missing elderly man with a mental disability canvassed the area surrounding a bus station near downtown Houston Wednesday, where he was last seen. Stewarts niece, Cassandra Stewart, said she drove her uncle to the Greyhound bus terminal, located at 2121 S. Main in Midtown. The two stops that were made up to Alexandria, Louisiana, he never made it off the bus, Quanell X said. Thats why we believe whatever happened to him, happened right here in Houston and somebody took his ticket, Quanell X said. Sharonda Davis spoke to Cassandra Stewart and Quanell X as they handed out missing persons fliers outside the bus station.