Debbie Rowe is ready to relinquish her claim to custody of Michael Jackson's children in return for a payment. Photo: Getty Images

Lawyers are woried Debbie Rowe will testify Michael is not the biological father of Prince and Paris.

Michael's mother Katherine is reportedly "nosing around" to find out what Debbie might say about the paternity of the two kids she bore while married to Michael if called to testify in court.

The Jacksons have allegedly made their inquiries on the eve of the family's wrongful death trial against UK music promoter AEG Live.

"Lawyers worry Debbie will testify Michael is not the biological father of Prince and Paris," said TMZ.

The celebrity news site insinuated that AEG may try to prove Michael's two oldest children do not have any legal ties to him, which could torpedo the family's damages claim.

In 2009, TMZ claimed that Michael was not the biological father of his eldest children, but the paternity of Prince and Paris has never been officially confirmed.

"Debbie is on the witness list for both Katherine and AEG Live," TMZ reported. "AEG has taken Debbie's deposition but - shockingly - AEG never asked Debbie a single question about paternity as it relates to MJ."

Katherine's lawyers have reportedly filed legal documents asking the judge to exclude any evidence of paternity. The judge has yet to rule on the motion. However, California law decrees that when a woman gives birth while living with her husband, the husband is conclusively presumed to be the father unless he's sterile or impotent. This means the Jackson family's fears may amount to nothing.

Katherine filed a wrongful death lawsuit against concert promoter AEG Live accusing the company of helping to cause Michael’s death by “pressuring him to prepare for his 2009 comeback concerts, despite his fragile health”. He passed away before the London show dates in 2009, with his personal physician Dr. Conrad Murray currently serving a prison sentence for his involuntary manslaughter.

The $40 billion suit was filed on behalf of Michael’s three children Prince, Paris and Blanket.

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