Michael Jackson’s son Blanket asked a judge to shut down his grandmother Katherine’s demand she be paid $500k from the late pop star’s estate. According to court documents obtained by RadarOnline.com, Blanket opposed Katherine’s request to be reimbursed legal fees associated with her fight with the estate’s executors. As we first reported, Katherine and the executors, John Branca and John McClain, have been fighting for over a year over the decision to sell one-half of Jackson’s music catalog to Sony. The executors asked the court to approve the deal in 2022. Katherine ran to court demanding t…