A Doozy Of A Family Squabble

Okay ladies I have yet another family squabble only this time not to do with the evil sister in law (imagine that) but my own family.

I called home to tell my mom that My husband and I are going to her house on Christmas Morning staying until about 3 and then going to my husband family for Xmas dinner. My sister called me a couple hours later to confirm the plans. Then she says that it's been 2 years now that I've gone to the in laws place for Xmas dinner and that me not being there for dinner with my family hurts my mom's feelings. She then said not to Forget them, I have a family too. Then my sister said that next year it should be different and then the real kicker she said you know we won't have many more xmases with mom. So therefore trying to guilt me. When I tried to explain that it is easier for my hubby and I to have dinner at the place where it is only a half hour away then 2 hours away and by the time dinner is done it's about 7 and my hubby is tired and has to drive 2 and half hours home in the dark on the highway with possible snow. I said it's easiest this way. But of course my words fall on deaf ears.

So ladies my question: am I being horrible? Does it sound like I am a horrible daughter and sister? What do you all think of this situation?

Also for a side note even though the hubbies parents live a half hour away doesn't mean we go to their place for every holiday like easter and thanksgiving we don't. This is the third time we're seeing them this year.