mother in law dilemma 😞😞😖... she wants us to go to my brother in law's for Thanksgiving but my mom…

mother in law dilemma 😞😞😖... she wants us to go to my brother in law's for Thanksgiving but my mom already asked us in October and she got upset with it. so now she wants us to stop by his brothers house on the way back from my mom's which is a 2 and half hr drive from where I live with 3 kids .. and I'm not comfortable going to there apartment because they live on the 36 floor and las time I was there before I was pregnant and got short of breath and headache from altitude and she lost it when I told her that I wasn't comfortable and that it was an excuse .. and my husband was like we don't have to go etc. and she lost it and started in on us. idk what to do.