TV Michael Jackson's Kids at 'X Factor' Tribute Published 9:04 PM PST, November 30, 2011 The X Factor contestants sang Michael Jackson's greatest hits on Wednesday night as a tribute to the late King of Pop, and MJ's kids were there to celebrate their dad's career.Paris, Prince, and Blanket sat in the audience with their grandmother Katherine as their uncles Marlon, Jackie and Tito pointed them out from the stage."We want to thank The X Factor for putting on this special tribute," said Marlon. "And we really appreciate the fans' support as well."Evidently, Katherine is a huge fan of the show. As a matter of fact, the matriarch told host Steve Jones that it's her favorite!The Jackson family's TV appearance comes just one day after the sentencing of Dr. Conrad Murray to four years in prison for involuntary manslaughter in the death of Michael Jackson.MORE: Conrad Murray Sentenced to Maximum 4-Year TermWatch an all-new X Factor tomorrow night on FOX.