We have made plans with my parents to take our kids to WDW for the kids' first trip next year. SIL has known about our plans for months. My SIL (DH's sister) announced to me that they have decided to go the same week. We can't move our week because it is hooked up with a visit to my dad's house in FL for Thanksgiving and we planned the first week of Dec b/c it's slower and all the decorations are up. So, I am probably being a big baby about this (and it is fine for you to tell me so) but I am a little ticked off and feel like SIL is hijacking our vacation. SIL and BIL are currently in WDW with their DS and my ILs for DS' first trip. I would never have dreamed of going the same week as them without being invited. I think it's rude. SIL and I are good friends, we live 20 minutes away from each other, and we have travelled with our DHs and another set of friends to WDW together previously. Until she makes reservations (both of us own DVC so that won't be until January), I am keeping my mouth shut. But if they go ahead with the plan, would you find a way to let her know that you plan on keeping your vacation plans independent?