Cheryl Ann Walker filed the guardianship petition in Los Angeles Superior Court on Tuesday. It states that Meadow Rain Walker, 15, has been living with her since the death of her son in a fiery crash on Nov. 30 north of Los Angeles.
The will of the "Fast & Furious" actor called for his mother to become his daughter's guardian and for his father to manage his estate, which has been valued between $16 million and $25 million.
Meadow Walker is the sole beneficiary of her father's estate.
Cheryl Walker's guardianship filing states that her granddaughter's mother is also living with her but is not an appropriate caretaker due to issues with alcohol.
The actor died after the Porsche sports car he was riding in crashed and burst into flames. Investigators estimated the car may have been traveling more than 100 mph before it crashed and killed the actor and driver Roger Rodas, a business partner and friend of Paul Walker.