Hi Diane, and welcome to planDisney!
I know all too well what it is like to have knee pain that prevents you from standing for long periods. I know that is not the best feeling especially when standing is the norm for most
Walt Disney World Resort vacations.
Yes! Your son will be able to push you through the queue at most of the attractions. Some lines may pose an issue, but no worries for attractions like
Big Thunder Mountain Railroad at
Magic Kingdom Park; a cast member will direct you to an alternate entrance, which happens to be at the exit.
If you do not plan to bring a personal wheelchair, you have options.
Wheelchair rentals are available at all Walt Disney World theme and water parks and Disney Springs for a fee. The fee you pay is per day and will be valid should you decide to park hop within the same day. Just simply return the wheelchair to the rental counter, head to the next theme park, show your receipt, and they will provide you with another chair. There is also a length of stay fee that can be purchased if you plan to visit the parks for multiple days; just keep your receipt handy. If walking to the theme park entrance (such as Magic Kingdom Park) proves difficult, at times, you can find wheelchairs at the front of the parking lots near the handicapped section that can be used to help transport you from the parking lot to the front entrance of the theme park. Once you arrive, return the wheelchair to a cast member at the rental counter and proceed to rent your wheelchair.
If you would like to have a wheelchair with you at all times, check out Disney's Featured Provider ScooterBug dot com. ScooterBug will provide you with a wheelchair so that you can explore your resort, around Orlando, or anywhere. They will drop the wheelchair off at your resort before your arrival and once your vacation is over, just return it to Bell Services at your resort, and the company will pick it up from there.
Please let us know if you need additional assistance before you arrive.
Have the most magical vacation in March!
Raquel