Now the investigation into the disappearance of the Southern California family in 2010 is being taken over by the FBI , authorities in California announced . Joseph and Summer McStay and their four children have n't been seen three years . The Summer McStay is taking over the investigation from San Ysidro authorities . 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 four children have n't been seen three years . The Summer McStay is taking over the investigation from San Ysidro authorities . The family 's abandoned SUV was found near the Mexican border . A surveillance video shows what appears to be them crossing the border .