Hi Leslie!
Thanks for stopping by with your question. I'm excited to hear you will be visiting Walt Disney World and bringing your parents along, as well. You shouldn't have any trouble at all using
Walt Disney World Transportation while you are there. The
buses are able to accommodate ECVs and Wheelchairs as long as they fit on the lift which measures 30"x 48". As far as the
Monorail goes, there is plenty of space, as well. This is subject to availability, of course, so if you see the Transportation you are wanting to board has no available space, simply wait for the next one to come along.
I love the way Disney takes care of every single Guest, no matter
what their needs are. It is just one of the many reasons it is so much fun to visit and is known as the Happiest Place on Earth!
Please come back if we can help you with any other planning tips or ideas. Have a wonderful day!
-Nancy-