Ok, here's our dilemma; myself, DH and two DD's ages 16 and 13 are going to Disney at the end of June. We have not told my brother and sister in-law and their son age 11. The reason being is that we go on vacation with them every summer for a week and we would like this to be a vacation for just the four of us before my older daughter starts her senior year in school. Here's the bad part, they were at our house last week and mentioned that they would like to go to Disney with us! AHHHH...we didn't tell them that we were going and now don't know how to handle it. They are not always the easiest family to be around, because my brother doesn't like to spend money for vacations: he'd rather spend it on something practicle. ..
We are spending a lot of money and want this to be a great family trip-any suggestions as how to tell them would be appreciated. And, anyone ever have a situation like this? Please offer any advice you can.

. I was in the same boat. My brother and his family are totally different from my family when it comes to vacations. We went to WDW last August and spent so much time arguing that it put a damper on the trip. They wanted to eat at fast food counters in order to save money, we wanted to spring for table services. They were constantly late and would get upset when we left them. They wanted to do every thing together, we wanted to go in different directions. We are early risers, they didn't get to the parks until noon, drove me absolutely crazy. This year we told the truth and said that this was going to be a immediate family vacation only and I'm still fighting the hard feelings it caused. All in all, I should have told a little white lie..
I have a similar problem.....my dad and step mom live in Fl, we live in IL.....1200 miles away, we want a family trip this year with no visiting.....last time we went to the parks with them she slowed us down.........had to get there tickets, ask about all the deals, took a survey, I am getting a little upset standing in the sun waiting on her, then they don't like epcot, it was a awful day. this year they are going to S.C. for the summer and back to Fl in Sept. I don't think I can lie?? but what if i just don't mention it??? it was a surprise from dh? 
The in-laws have hinted around that they are going to Florida this summer but we just pretend like we don't hear them. 