Big WDW traveler here! I've been to the World over 30 times, but this is my first time with MDE/FP+. After an initial mini panic about having to choose FP rides 60 days out (maybe I don't, but I feel like I do to get what we want) and not always knowing which park we want to commit to each day, I'm really liking the new system. I'm a huge planner, and I used to sit with a spread sheet and try to plan the best attack. Now, the system lets me do it "officially" and I kind of like it.
Anyway, we are a family of 6 traveling with our 4 little kids in May. MIL, FIL, SIL, and SIL's BF decided they would like to come with us. So, I put everyone in MDE and linked our accounts, etc. Then, I sat down with my little spread sheet (OCD, much?) and planned my FP+ around our meal times, nap times, estimated meltdown times, parade times, fireworks times, etc. I did it right at 60 days out. I was so pleased with my plan I could burst!
Now, today, I just looked at my itinerary. SIL MOVED my FP+!!!!!!!!!!!!!!!! I could scream! I noticed because I had selected 9:35-10:35am at KS on our AK day. I like to do the safari in the morning to see the animals the best. I noticed it was at 1:45pm now. I knew I didn't schedule it then because I would never schedule it at nap time and I knew I did it first thing in the morning. Well, SIL and her BF have a breakfast reservation somewhere and didn't think they would be there yet, so they moved it to later so they could go with us. Then, on MK day, they removed our meeting Mickey FP+ because "Why would you need a FP to see Mickey? He's all over the park." and replaced it with PoC because they want to go on it with our kids. UMMMM, I don't NEED a FP for PoC! The line shouldn't be that long! They also replaced Storytime with Belle (because they don't know what that is) with Jungle Cruise (because all kids like Jungle Cruise)!!!!!!!!!!! I'm having a panic attack!
I have no idea what else she moved because she doesn't "remember." WTH???
I do like the new system, but I'm surprised it allows other people not on your room reservation to replace and move your FP+. Anyone else have this problem?
Anyway, we are a family of 6 traveling with our 4 little kids in May. MIL, FIL, SIL, and SIL's BF decided they would like to come with us. So, I put everyone in MDE and linked our accounts, etc. Then, I sat down with my little spread sheet (OCD, much?) and planned my FP+ around our meal times, nap times, estimated meltdown times, parade times, fireworks times, etc. I did it right at 60 days out. I was so pleased with my plan I could burst!
Now, today, I just looked at my itinerary. SIL MOVED my FP+!!!!!!!!!!!!!!!! I could scream! I noticed because I had selected 9:35-10:35am at KS on our AK day. I like to do the safari in the morning to see the animals the best. I noticed it was at 1:45pm now. I knew I didn't schedule it then because I would never schedule it at nap time and I knew I did it first thing in the morning. Well, SIL and her BF have a breakfast reservation somewhere and didn't think they would be there yet, so they moved it to later so they could go with us. Then, on MK day, they removed our meeting Mickey FP+ because "Why would you need a FP to see Mickey? He's all over the park." and replaced it with PoC because they want to go on it with our kids. UMMMM, I don't NEED a FP for PoC! The line shouldn't be that long! They also replaced Storytime with Belle (because they don't know what that is) with Jungle Cruise (because all kids like Jungle Cruise)!!!!!!!!!!! I'm having a panic attack!
I have no idea what else she moved because she doesn't "remember." WTH???
I do like the new system, but I'm surprised it allows other people not on your room reservation to replace and move your FP+. Anyone else have this problem?

I think you just got your first warning on how this trip might be heading..... You know what you are doing, the fact that she didn't even try to talk to you first about making some changes tells me that she is not going to be easy to travel with. Peace be with you
good luck and lots of patience!!!