Bruce's parents have asked the judge to remove them as guardians of the kids ... which then clears the way for Bruce to regain custody. But the sisters are objecting because they don't think "someone suspected of killing their mother should be in charge of the kids."
UPDATE: Bruce's mother tells TMZ she wasn't invited to the memorial on Sunday and that she only knows of the memorial "because of the media."
UPDATE: The judge has ordered that the children are to not attend the memorial service for Monica that is being thrown by the sisters on Sunday -- or any other memorial service.
UPDATE: Now here's a twist. The lawyer for Bruce's parents is concerned ... if his clients withdraw their guardianship petition Bruce might not get custody. So the lawyer just said Bruce's parents would not withdraw their guardianship over the kids. The judge, slyly, said "I don't think they get to hedge their bets."
UPDATE: The judge just said he's willing to remove Bruce's parents as guardian and will hear arguments from the sisters about appointing a new guardian.
UPDATE: The lawyer for Bruce's parents told the judge the guardianship papers were filed because there was "no parent available" to take care of the kids -- Bruce was detained in Mexico. Now Bruce is back.