EXCLUSIVE

Katherine Jackson has been temporarily stripped of her guardianship over Michael Jackson's 3 kids, and an L.A. judge just appointed Tito Jackson's son TJ to become the temporary guardian.

And there's more ... Judge Mitch Beckloff advised TJ and his lawyer, Charles Shultz, to seek a permanent guardianship, after hearing stories that Katherine may have been held against her will "from third parties." Translation -- Randy, Janet, Jermaine and Rebbie.

Before handing down the ruling, TJ's lawyer told the judge TJ got a strange phone call from Katherine yesterday. TJ said, "I've never heard my grandmother talk like that." TJ added, "She wasn't sharp. The pauses, choice of vocabulary ... she has not used certain phrases like that before." TJ thought she was talking in code. TJ choked up as he addressed the court.

TMZ broke the story that TJ would make this move -- a move supported by Paris, Prince, and Blanket, as well as the Michael Jackson Estate.

The judge said Katherine was not suspended for wrongdoing, but that she was prevented from doing her guardianship by the third parties who are clearly Randy, Janet, Jermaine and Rebbie.

Katherine's lawyer, Sandra Ribera, added that she (Sandra) has been to the house several times recently and believes Katherine has been held against her will.

Katherine's lawyer, Perry Sanders, says he would vigorously oppose any move to permanently strip Katherine of her guardianship duties.