Katherine and Tito Joe "TJ" Jackson will file their plea for co-guardianship of Michael Jackson's children today.

Michael's mother and nephew are planning to share custody of Prince Michael, 15, Paris, 14 and 10-year-old Blanket after Katherine was stripped of her rights with temporary control given to TJ, and they plan to begin court proceedings tomorrow.

According to RadarOnline, Katherine's lawyer Perry Sanders said in a statement, "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 [the judge] 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."

The new agreement has been approved by Diana Ross, who was named a back-up guardian in Michael's will. "Diana has no qualms whatsoever about the new custody agreement, she only wants what is best for the children. Diana knows that the children are old enough to decide who they want to live with and she defers to what they want. While Diana hasn't been a big part of their lives because she lives on the East Coast, she is very fond of them," a source.