Rider Swap with Disabled Adult

[Buddy40]

My wife and I will be taking her adult sister who is developmentally and physically disabled, to WDW this Christmas (yes well aware of the crowds). Due to my sister in law’s physical disabilities she won’t be able to go on many rides except for the mildest ones. For those rides my wife & I would still like to ride, do they offer a rider swap for an adult. I know one of us could just exit with my sister in law out the chicken exit, but it would be preferable if we could both ride it either together or separately. We will be focusing more on characters, shows/parades, and the general holiday vibes for this trip. But my wife & I would still want to hit some rides like Tron, Space Mtn, Everest, FOP, etc. thanks.