The father of accused child killer Casey Anthony sobbed on the witness stand on Wednesday as he testified that he bought a gun in August 2008 and planned to force his daughter's friends at gunpoint to tell him what happened to his then-missing granddaughter.George Anthony, called back to the witness stand by the defense, also said he tried to commit suicide in January 2009, a month after 2-year-old Caylee's skeletal remains were found."It just felt like the right time to go and be with Caylee," he told jurors in the sixth week of the highly publicized first-degree murder trial in Orlando.Prosecutors...