LOS ANGELES—Michael Jackson’s mother asked a Superior Court judge on Monday to name her administrator of her late son’s estate so she can ensure the King of Pop’s three children are its beneficiaries.

The court filing states that Jackson’s parents believe he died without a valid will. Supporting Katherine Jackson in her petition bid to administer the estate was Jackson’s father, Joe Jackson.

The court documents state that Katherine Jackson “intends to marshal assets of the decedent for the exclusive use of the decedent’s three children — her grandchildren — after payment of debts and expenses of administration.”

Earlier, Superior Court Judge Mitchell Beckloff granted Katherine Jackson’s request to assume temporary guardianship of her son’s children but did not immediately rule on her request to administer their estate.

Beckloff scheduled hearings for July 6 and Aug. 3 to take up the matters, including whether to also approve a request by Jackson to become permanent guardian of her son’s children.

So far, a will for Michael Jackson, which might spell out his wishes for care of his children and his estate, has not surfaced.