Vacation Plans

For the past several years Kevin and I have been using our vacations to visit family or go on vacation with family, in fact we haven't even had our honeymoon. Since our wedding was a destination wedding for everyone we didn't think it was right to take off for a honeymoon right away. So the plan was to spend a week here in RVA with everyone and then the following week go on our honeymoon. And then I got a full time job and so there was no way I was going to be able to get 2 1/2 - 3 weeks off within my first 6 months. So we pushed off our honeymoon till March. Kevin's grandfather died in February and so the time off (& money) we were going to use for our trip was instead used for a last minute trip to the UK. So we settled on going away for our 1 year anniversary. Then Kevin's parents decided that they wanted to come visit us over the summer, but wanted to go somewhere else in the States besides coming to RVA. The remainder of our vacation time went to that as well as the 5 days we used for Christmas in England. And then myMom wanted us to go to Colorado (where Wiki lives) for 4th of July. Kevin mentioned the trip to his parents and told them that they could come too.
After thinking about it a while one evening I told Kevin that I would rather the vacation we took in 2009 be just the two of us and somewhere not in the USA. He suggested Egypt as he's always wanted to go there. We decided to do it in the spring as soon as we had the days saved up and so that if for *some* reason we need more time in the fall we would have it available.
Over the holidays Kevin, Mum and I were sitting in the living room when Kevin asks me again, "So you don't want to go the Colorado for 4th of July right?" Immediately Mum pipes up complaining that she thought her and Dad were going to Colorado with us. Then she asks why we're not going and Kevin stops talking. Eventually I get to tell her that we've decided to go to Egypt in the spring. Of course she starts complaining about if we're going away then when are they going to see us and all that. She knows that we trade off Christmas so that we won't be coming over in December 2009. Well apparently every time she calls she complains to Kevin that they're not going to see us this year and such. And now I think Kevin is wavering on our trip. I've told him to tell his parents that they can visit us whenever they want, we'll just not be able to do more than an extended weekend and most likely be working some days that they'll be here. Is this unfair? Does anyone spend all their vacation visiting family (or them visiting you?) I was willing to not go on my family trip this year so that Kevin and I could have our vacation together. I'm going to be really annoyed if Kevin backs out because of Mum.