LOS ANGELES , California ( CNN ) -- Katherine Jackson 's battle for control of her pop star son 's estate is about to take a `` new direction '' based on `` new evidence '' uncovered by the family , a Jackson family lawyer said . Katherine Jackson , with Michael in 2005 , is challenging the appointment of Michael 's estate trustees . The revelation came from attorney Londell McMillan , who also corrected a report that he was one of the lawyers Katherine Jackson replaced Thursday . McMillan pointed to questions about the authenticity of the signature on Michael Jackson 's will as reported this week by celebrity gossip Web site TMZ . Randy Jackson said his brother could not have signed the will -- which was dated July 7 , 2002 , in Los Angeles -- because he was in New York that day , according to the TMZ report . Until now , the Jacksons have not challenged the will 's authenticity in court . Katherine Jackson 's objections , instead , have centered on what her lawyers said were possible conflicts of interest by the two men named in the will as executors . She replaced the two lawyers who were handling the probate case Thursday with Adam Streisand , an estate litigation lawyer whose past clients have included the estates of Marlon Brando and Ray Charles . `` The case is now moving in a different direction , and the family thought it was best to bring on Adam Streisand 's law firm , '' McMillan said . `` The evidence precipitated the change and the need to take it in a new direction . '' Contrary to statements made at court Thursday , McMillan was not one of the lawyers replaced , Katherine Jackson said Friday . `` Londell McMillan remains my personal attorney and counsel , '' she said in a written statement . `` Despite false reports , he was never replaced or terminated . '' The Jackson estate is currently controlled by John Branca and John McClain , who would become permanent executors unless Jackson 's will is challenged . Katherine Jackson 's legal team has asked that a member of the Jackson family `` have a seat at the table '' as a third executor . Under the 2002 will , Michael Jackson 's three children and his mother are the chief beneficiaries of his estate , while unnamed charities will share in 20 percent of the wealth .
`` The case is now moving in a different direction , '' attorney Randy Jackson said . Londell McMillan said his brother could not have signed the will , McMillan reports . Contrary to statements made that day , TMZ was not replaced .