Jackson's family wants to know more specifics about what role AEG, the concert promoter that was staging his 50-date concert series at London's 02 Arena, was playing in his life, said the person, who requested anonymity because of the delicate nature of the situation. They also want to know more about the role of his advisers and representatives, who they believe were put in place by the promoter.
AEG spokeswoman Natalie Whorms in London had no comment Saturday.
Jackson never communicated to his family who he had in place to handle his business affairs, the person said, adding that they were told by the singer's phalanx of advisers that he likely had a will, but it may be many years old. The family is distrustful of what they are being told but they are determined to find out more, the person said.
"There are decisions going down without the family being in the loop; it's becoming an issue," the person said.
Randy Phillips, AEG Live president and chief executive, said earlier Friday that it was Jackson who insisted that Dr. Conrad Murray, a financially troubled cardiologist who was with the entertainer when he collapsed Thursday, be put on the tour payroll.
"As a company, we would have preferred not having a physician on staff full-time because it would have been cheaper without the hotels and travel, but Michael was insistent that he be hired," Phillips said. "Michael said he had a rapport with him."
Jackson collapsed Thursday at his rented home in Los Angeles. Police seized Murray's car in search of evidence, but have insisted that the doctor has been cooperative and do not consider him a criminal suspect.
Records reveal years of financial troubles for Murray, who practices medicine in California, Nevada and Texas; his Nevada medical practice, Global Cardiovascular Associates, was slapped with more than $400,000 in court judgments, and he faces at least two other pending cases and several tax liens.
The person close to the family said that while there were reports that the singer was distant from his family, Jackson spoke with his mother, Katherine, quite regularly and his father, Joe, had seen his son shortly before his death. His other eight siblings, including fellow superstar Janet, may not have talked to him recently but were not estranged.
Much of the family was holed up Friday inside the Jackson family's Encino compound, including his three children, according to the person, who described them as doing "pretty good."
"I don't think it's fully set in yet," the person said.
The pop star left behind three children: Michael Joseph Jackson Jr., known as Prince Michael, 12; Paris Michael Katherine Jackson, 11; and Prince Michael II, 7. The elder children were born to ex-wife Deborah Rowe, while the youngest is his biological son, born to a surrogate mother.
Rowe and Jackson married in 1996 and divorced in 1999.
No family members were present in the mansion when Jackson died Thursday, the person close to the family said. In the 911 call released by fire officials Friday, an unidentified caller tells a dispatcher that Jackson's doctor is performing CPR.
Asked by the dispatcher whether anyone saw what happened, the caller answers: "No, just the doctor, sir. The doctor has been the only one there."
Coroner's officials said they released Jackson's body to his family late Friday night. The family is still trying to determine what kind of memorial to have for Jackson and when, and are debating between the idea of having a private ceremony or a grand celebration open to the public, the person close to the family said.
Jackson appeared to have suffered a heart attack, another person with knowledge of the situation who was not authorized to speak publicly and requested anonymity told the AP on Friday. A heart attack is a blocking of the arteries that deprives the heart of adequate blood and can cause cardiac arrest.
Jackson's brother Jermaine said Thursday that it was believed the pop singer went into cardiac arrest, an interruption of the normal heartbeat that can be caused by factors other than heart attack.
The Los Angeles County coroner's office, which completed its autopsy Friday, said there were no signs of foul play or trauma, but determining the cause of death will require further tests that will take six to eight weeks.
Phillips said AEG Live held multiple insurance policies covering cancellation of the shows, and that some time in February Jackson submitted to several hours of physicals that the insurance underwriter insisted upon, and that Jackson passed them all.
"We had pretty good coverage, but a lot of it is going to depend on the toxicology results," he said. "We need to know what the cause of death was."
AP Writers Beth Harris and Mike Blood in Los Angeles and Shawn Pogatchnik in Dublin contributed to this report.