So my FI is on the phone with his mom talking about holiday plans and ughh! I just need to vent to people who understand

Every holiday is such a stress with his family. FI and I had plans set for the Christmas weekend, which involved going to my family's Xmas eve and day festivities. During Thanksgiving we made it explicit that Thanksgiving we spent his FI's side and Christmas we would spend with my side.
Now, two days before Christmas Eve, FMIL has pressured FI into changing our plans, and there's issues with with his dad being difficult about not coming to Christmas eve hosted by my parents, which the FI's whole family was invited to, and even more issues about what to do with their dog. Seriously, that dog rules their lives...last year they brought her to the formal Xmas eve at my parent's, which is entirely inappropriate...I'm not bashing all dog owners, believe me! But everything revolves around her and it's unhealthy. FI is still on the phone with her and plans are being changed, again...ughh!!! Now she thinks that he's trying to not see her. I can't wait until we have our own apartment next year and can call the shots of where we go!!
Sometimes I wonder why I'm marrying into this family...then I remember how much I love FI...but really, its times like these I realize that I'm choosing to be stuck with this forever :S
If any other people on this board deal with difficult in-laws, how do you deal? Any suggestions would be appreciated....