Hi Lisa!
Welcome to planDisney!
The Disneyland Resort is expansive, covering approximately 500 acres between
Disneyland Park,
Disney's California Adventure Park,
Downtown Disney District, and the Resort hotels. That is A LOT of walking, so I am glad you are considering an Electronic Conveyance Vehicle, or ECV, for your parents.
Lisa, the Disneyland Resort offers
ECV rentals for Guests to utilize within the theme parks and Downtown Disney District. The ECVs are rented on a first-come, first-served basis, and so I recommend arriving at the parks as early as possible to secure the two scooters. The daily charge per ECV includes a refundable deposit. Bear in mind that the ECVs must be returned at the end of the day, and your parents will need to navigate their way either to the vehicle or to the resort. If you will be staying on property for vacation, an option for you may be to book a
length of stay ECV rental. ScooterBug, Disneyland's preferred provider of ECVs, strollers, and wheelchairs can deliver an ECV to your resort prior to your arrival. You can contact ScooterBug and book an ECV at the link above.
Lisa, I hope this helps you plan an amazing trip to the Happiest Place on Earth!
Malanie