According to Marc Schaffel, a former business partner of Jackson's close friend, the 49-year-old is planning to attend the hearing in Los Angeles Superior Court for temporary guardianship of the children Prince 12, Paris 11 and Blanket 7.
"(Debbie) says that she will definitely be at the custody hearing," People magazine quoted Schaffel as saying.
Meanwhile, the debate over the custody further increased, after it was revealed that a third person might try to claim rights.
Michael's sister La Toya has revealed that her brother had made another will in 2007, in which he might have named someone else as their preferred guardian. She said that the 50-year-old singer actually wanted the kids to live with his eldest sister Rebbie, 59.