Hi Sky,
Welcome to planDisney!
I am happy to hear that your daughter qualified for the
Disability Access Service (DAS). This service has been helpful to my family in the past. When you use this service, you will be able to secure a return time for the attraction. My first suggestion would be to have your sister's family enter the line/queue as soon as you know your return time. Theoretically, they should arrive to the front of the line at about the same time as your return time. Of course, the timing may not be exact, but you could speak with the cast members at each attraction. They will be able to determine if you can meet-up in the line. You could also consider purchasing the
Lightning Lane Premier Pass or
Lightning Lane MultiPass. With the Lightning Lane Premier Pass, just be sure to check the list of
available resort hotels so that you know if your sister's family qualifies for this pass.
As you continue to plan, I hope you have considered your dining with the larger party. If you have not yet done so, be sure to add
dining reservations for your sister's family. If you cannot find the exact dining times to correspond with existing reservations, make a reservation for a time as close as possible. When you arrive to the restaurant, speak with a cast member to ask if they can seat you together. Although these requests are not guaranteed, cast members have tried their best for my family in the past when we have faced a similar situation!
I also suggest that you consider
Memory Maker if you have not already added it to your reservation. With such a special trip planned, your photos will be important for years to come. We love having access to the digital downloads of all of our pictures taken with
Disney PhotoPass Service® Photographers.
Sky, your arrival date is approaching soon! I trust that the countdown has begun in your household. We cannot wait to welcome you to the Walt Disney World® Resort!
Magic and memories,
Donyell