All eyes will be on Michael Jackson's two eldest children as they are expected to be the star witnesses in a wrongful death suit filed by the family against the concert promoters who sponsored the singer's ill-fated "This Is It" tour.
The trial, which begins today in Los Angeles, is expected to last three to four months. Prince, 16, and his 14-year-old sister, Paris, are expected to testify about their father's final days leading up to his 2009 overdose death.
The civil suit filed by Katherine Jackson, 82, and the Jackson kids claims Anschutz Entertainment Group (AEG) was aware Michael Jackson was "not psychically well." The suit also alleges that AEG put "its desire for massive profits over the health and safety of Michael Jackson."
The Jackson family claims that the company "committed negligence against Jackson" by requiring him to be treated only by the doctor AEG hired, Dr. Conrad Murray.
Murray was found guilty of the involuntary manslaughter in 2011 for giving Michael Jackson a fatal dose of propofol. He is currently serving four years in prison for his role in the pop star's death.
ABC News legal analyst Dana Cole said this trial will come down to one question.
"The fact of the matter this has very little to do with the children's testimony. It has everything to do with who was Dr. Murray working for. AEG or Michael Jackson?" said Cole.
"This is really a phase two of the Conrad Murray case. He was found guilty of negligence in phase one. This is now a focus on financial damages for the family as a result of his negligence," Cole added.
The Jackson family is seeking millions in damages for trauma and emotional distress.
AEG did not respond to ABC News' request for a comment.
Prince and Paris' testimony is expected to be the emotional tipping point of the trial as they can give a rare glimpse inside their once secret world with their famous father.
"One of the important things the children will need to testify about is the emotional impact, the loss that they feel, as a result of the death of their father," Cole said.
Jackson spent years shielding his children from the public eye, but the children are hardly camera-shy anymore. Prince recently took on a new role as a correspondent for "Entertainment Tonight," and Paris is about to make her acting debut in an upcoming live action-animated film called "Lundon's Bridge and the Three Keys."
Jackson's youngest child, 11-year-old Blanket, is not expected to testify because he was too young at the time of his father's death.