I have made ADRs for our September trip. I have questions about how the bills and tips will be handled. We are 5 families on vacation together and are not on any dining plans. Here are the specifics:
Family 1 - 2 adults, 1 child
Family 2 - 3 adults
Family 3 - 2 adults
Family 4 - 2 adults
Family 5 - 3 adults, 3 children
Example:
2 tables of 8 reserved for Chef Mickey's - are they going to break up our check into 5 different bills and will these each include the prorated 18% or not?
Biergarten Buffet - Families 1, 2 & 3 are reserved - 3 bills or 1?
Whispering Canyon Cafe - Families 1, 2 & 3 are reserved for 1 table of 8 - same question
What happens if some of the folks want to leave cash tip and some want to charge to their credit card? I guess that doesn't matter if the bills get split so I'm hoping they will always split but understand that is a lot of work for our server.
Oh yes, for further complications

, my sister (an adult in Family 2) is planning on inviting a coworker/friend on our vacation which would be an additional adult at every meal. Will they be able to accomodate her or will it cause major issues with our ressies? She is willing to pay her own portion of everything but I just think it will be a big problem when all of a sudden we need seating for 9 not 8 and am wondering if I should call ahead and try to get things changed or if it will cause my current ressies to cancel and then I'll be stuck with less desirable times or no availability. My sister is saying if we can't get her friend a seat then she will eat at counter service with her and we'll be 1 adult short from what I previously booked.

Is that going to be an issue? My biggest concern for this situation is our CRT ressie for 2 tables of 4.
THANKS IN ADVANCE!