Michael Jackson’s mother Katherine demanded her six-figure legal bill be paid in full despite objections by her grandson Blanket and the executors of her late son’s estate — claiming the estate has over $1 billion available. According to court documents obtained by RadarOnline.com, the 93-year-old asked the court to grant her motion to be reimbursed $561,548 in legal fees. Katherine racked up the fees as she fought the executors, John Branca and John McClain, over the recent $600 million sale of one-half of Jackson’s music catalog. For months, Katherine tried to block the deal from being final…