It went pretty well. She still has a lot of work to do, and in some ways I was disappointed she didn't have certain things done/cleaned up, in other ways I was really impressed. Everyone had a really great time. My BIL is once again the family hero, as he took over co-hosting duties with my mom.
We did end up leaving the dogs with my IL's for the day, which was a great idea. I started to get nervous as we got closer to the house but DH reassured me it was fine. Our parents are very similar, and while I wouldn't put them in the hoarding category, they tend to collect in the same ways, so he understands the frustrations.
Thanks for all the thoughts and kind words, TIP.
Re: Update on Christmas at my Mom's