Some rides work like a fast pass, but you have to get a return time for the party. Otherwise, Fastpass or better Maxpass is normal with most rides.
They all can go together at the front of the line as of 3/2018
No they give you a time to return to ride the ride
They will let the disabled person rejoin their party at the front if the line once the party has made it that far in the line.
In some of the rides they do
Yes...either rent a wheelchair for the disabled guest from the Disney park or get your own. You will get priority in the line.
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