Katherine Jackson, matriarch of the Jackson family, has surrendered her co-guardianship over Blanket aka Bigi, Michael Jackson's youngest child, who is now 15. According to court documents, Katherine has filed papers to hand over sole guardianship of Blanket (real name: Michael Joseph Jackson, Jr.) to TJ Jackson, Blanket's 39-year-old cousin. "Katherine is no longer needed to fulfill the duties that were necessary when joint-guardians were appointed," the documents state. "Given her own age  and the fact that [Blanket] is now 15 years old, Katherine feels that TJ is able to assume all necessary responsibilities of the guardianship for the Minor Child." Along with TJ, Katherine was appointed joint legal guardian of all three of Michael's children (Blanket, Paris and Prince) on Sept. 14, 2012, following Michael's tragic death.