The parents of Pop icon Michael Jackson claimed Monday in court papers that their son died intestate, meaning he left no valid will.

In the papers, Michael's mother Katherine Jackson requested the court allowing her to serve as administrator of Michael’s estate and as custody of her son’s three children.

A Los Angeles Superior Court judge on Monday approved the appointment of Katherine Jackson as temporary guardians of her son's three children, but not for estate, according the Associated Press reports.

A hearing has been set for August 3. In a written petition to the court, Katherine says that she intends to marshal assets of (Michael Jackson) for the exclusive used of (Michael's) three children--her grandchildren-- after payment of debts and expenses of administration.

Given the nature and extent of the descendant assents, it would be difficult if not impossible to quantify their value at this time, she claims in the papers.

Michael Jackson has three children, Prince Michael, 12, Paris Katherine, 11, and Prince Michael II, 7.

The first two are Jackson's children from his ex-wife Debbie Rowe and the third from an unidentified surrogate mother.

In court papers, Joe and Katherine Jackson said the children had no relationship with their biological mother.

It is unclear whether Rowe may also seek custody.