Jackson's Mom Keeps Option Open to Contest Will

7/17/2009 9:03 PM PDT

Jackson's Mom Keeps Option Open to Contest Will

Lawyers for Michael Jackson's mother Katherine filed legal papers setting the stage for a fight over the singer's estate.

Katherine's lawyers are not willing to accept that the will presented by Michael's lawyer, John Branca, is valid. In the papers, Katherine's lawyer writes about the "purported will" Branca filed.

Katherine's lawyers note that the 2002 will has a "no contest" clause, meaning anyone who mounts a legal fight over the will gets nothing.

Katherine's lawyers want a judge to decide if that clause would apply if she fights the appointment of the executors under the will.

Katherine's lawyers are hedging their bets, saying they are "continuing to collect and review relevant information."