By Jen Heger - Breaking Celebrity News Assistant Managing Editor

TJ Jackson, temporary guardian of Michael Jackson's three children, will formally file a motion in the custody case on Thursday morning, asking a judge to make him permanent co-guardian, along with the kids' grandmother, Katherine Jackson, Breaking Celebrity News is reporting.

"Before 10 this morning, Charles Shultz (TJ Jackson's lawyer) will give notice to interested persons that we intend to file a pleading tomorrow regarding co-guardianship. The pleading will speak for itself and be consistent with my prior statement issued on this subject. Tomorrow we will learn the court's pleasure on when and how his honor chooses to handle the request being made tomorrow. No further statements will be made regarding this pleading until subsequent to us learning how the Court wishes to proceed," Katherine Jackson's lawyer, Perry Sanders said in a statement.

As we previously reported Diana Ross will sign off on a new proposed custody agreement, in which Michael Jackson's three children, Prince, Paris, and Blanket will have two guardians, their grandmother Katherine Jackson and TJ Jackson, son of Tito.

Ross must OK the agreement since Michael stipulated in his will that he wanted the legendary Motown singer to care for the kids, should Katherine not be able to fulfill his wishes.

"Diana has no qualms whatsoever about the new custody agreement, she only wants what is best for the children. Diana knows that the children