Personally, I think they are not taking you and your family into consideration here at all. Christmas is one week from today and they still haven't given you what plans they have? People make plans for Christmas, weeks in advance...especially family. If you usually go, then possibly your sister in law is just assuming you will be there??. I would call her asap and instead of asking, you will have to ask directly ( nicely of course) what the plans are this year as you want to make plans with your parents and your son's father and they are waiting to hear from you. Merry Christmas, hope all goes well for you.