A bitter dispute over who will call the shots in probating Michael Jackson's will is developing, with several of his family members pitted against one another.

Michael's mom Katherine Jackson's attorney, Londell McMillan, will reportedly challenge the executors Michael Jackson picked, John Branca and John McClain.

Most of the brothers, with the exception of Randy, are angry that McMillan is challenging Branca and McClain, both longtime MJ advisors and friends.

Ultimately, Joe Jackson has asserted his influence over Katherine to hire McMillan. Sources say she is being manipulated and doesn't have real objections.

Michael left 40 percent of his estate - and full guardianship of his three children, Prince Michael, Paris and Blanket, 12, 11 and 7 - to Katherine Jackson.

He left the other 40 percent of the estate to the kids and 20 percent to charity, so it is unlikely Katherine would object to anything in the will. Right?

McMillan denied this report, which first surfaced on TMZ, to Access Hollywood, saying that Katherine does not object to the will and that she has not yet made a decision on whether to challenge the appointed executors.