Los Angeles , California ( CNN ) -- Michael Jackson 's three children did something recently they 've never before done : signing their autographs on something to be sold . Blanket , Paris and Prince Jackson put their names on a designer belt produced as a tribute to their late father and to raise money for the Jackson family museum planned for Gary , Indiana . The merchandising deal for the crystal-encrusted belt is also a first -- the trustees of the Michael Jackson estate authorizing the Jackson family to produce and sell memorabilia in the pop star 's name . Katherine Jackson dropped her challenge for control of her son 's estate last October , but her husband still has a legal objection pending in probate court . `` This is a truly one-of-a-kind opportunity , '' said Jerry Olivarez , the Jackson family friend who brought the deal together . `` I know of no other item that has ever been made available to the public that has been signed by both the parents and children of Michael Jackson . '' The youngest , who was born in 2002 , signed his name in true `` John Hancock '' style , taking up the most room with large block letters spelling `` BLANKET . '' Prince , 13 , helped his younger brother by adding `` Jackson '' below his first name . Paris , 12 , showed flair with her signature , using a heart to dot her `` i '' and giving her `` r '' a long , flowing branch . Grandparents Katherine and Joe Jackson sat next to each other on a sofa in the Jackson 's Encino , California , home to add their autographs to the `` artist proof '' of the belt . The leather belt was designed by Simon Tavassoli and a limited run of 7,000 are being handmade at his Newport Beach , California , studio . Each unsigned belt will retail for $ 1,500 , he said . The only belt signed by the three children goes on auction Thursday night , Tavassoli said .
Michael Jackson 's kids autograph a tribute belt . The crystal-encrusted belt will go on auction . 7,000 belts will be sold at $ 1,500 each . The belt sale is to raise cash for Jackson museum .