The developments came after days of turmoil among the Jackson family that included an altercation between relatives on Monday and a relative reporting Katherine Jackson missing before she was located safely with other family members in Arizona.
Jermaine Jackson has said his mother was following doctor's orders to cut off communications with the children, who range in ages from 10 to 15. He didn't provide further details.
Katherine Jackson's lawyer, Sandra Ribera, expressed concerned that Katherine Jackson may have been held against her will. She said one of the singer's children told her a conversation with the 82-year-old woman on Tuesday seemed to be monitored and influenced by others in the room.
Arizona authorities contacted Katherine Jackson on Sunday evening and it was determined she was safe, though her lack of communication with her grandchildren was described by TJ Jackson and others as unusual and unprecedented.
In addition to concerns about the safety of Jackson's children, some of Michael Jackson's siblings have recently called on the executors of his estate to resign.
The estate, which recently reported it saw $475 million in gross earning since Jackson's death in June 2009, has denied wrongdoing and called the accusations "false and defamatory."
The Jackson children have remained at the home they share with their grandmother in suburban Calabasas amid questions about Katherine Jackson's whereabouts and why she hadn't spoken with them since July 15.
Sheriff's deputies were called to the house on Monday after two factions of the family were involved in Monday's driveway confrontation. The incident remains under investigation.
