Joseph and Summer McStay and their two children have n't been seen since 2010 . Score: 6 The family 's abandoned SUV was found near the Mexican border . A surveillance video shows what appears to be them crossing the border .
Joseph and Summer McStay and their two children have n't been seen since 2010 . The FBI is taking over the investigation from San Diego County authorities . The family 's abandoned SUV was found near the Mexican border . A surveillance video shows what appears to be them crossing the border .