Trying to make Thanksgiving plans

Lately I have been wondering just when people who decided to get a divorce came to that decision. What was the final thing that made them say,"that's it". My friend C told me once that it was when his (now ex)wife got her third boyfriend! I don't have anything that obvious staring me in the face. Then again, maybe I do have signs that I am just ignoring. This week, my husband and I talked about plans for Thanksgiving. He said he wanted a quiet, low-key kind of day. Sounds good to me. I work in healthcare, so, lucky me, I have to be at work that day 4-12, but I figure we can still have a nice meal together at about 1 or 2pm. I asked what he wanted to do and he said anything, as long as it did not involve my Mom. Ouch. The woman is almost 70 and if she does not spend the holiday with me, she will most likely spend it alone. My siblings are not close to her and I doubt that they will even invite her to be part of their holiday plans. Last year she came here and I put her up in a hotel about a ten minute walk from here. We hung out together during the day and I still got to spend time alone with my husband at night and get a good night's sleep. I thought that it went well and figured that we would do the same thing this year. In D's defense, she is bipolar and does not take medication to manage her illness. She can be annoying and will probably talk way too much, but it is only a couple of days. My job involves working with mentally ill people, so I have a higher tolerance for certain behavior and am used to dealing with her. I work with far worse 5 days a week(and that's just the staff, ha ha) The reality is that she is the only Mom that I have and I choose to accept her as she is and try to have some good times with her. We have more good days than bad days. We usually spend Christmas with D's family, so I think of Thanksgiving as the holiday that I spend with my Mom. I guess that I am answering my own question here. I can get another husband someday. I only have one Mom.