UHH sometimes MILs can just mess things up. Last November my parents, sister and her family, brother, and my family went to WDW. Well the last two days of our trip DHs mom and stepdad came. We thought great they will get to spend time with the girls, what great memories. Well, they didn't spend hardly anytime with the girls they did their own thing and we just sat around while the y rode the rides. Then they got mad at us for not spendign time with them. I understand they wanted to experience WDW but they live in Florida, we live in Texas we only get to see them a few times a year. UHHH hopefully if they decide to join us in December things will go better.
Good luck to you. I feel your pain