My father died from vascular dementia back in 1993, when there were no support services in the U.S. We had a difficult time with him but managed to keep him at home by supporting my mother as best we could. I would run over every weekend, a 3 hour drive one way, make meals, stay up all night with him (he had sundown syndrome), and try to keep him calm so my mother could sleep. My experience with vascular dementia was that it was very, very unpredictable.
My experience with Alzheimer's, which dominated in my mother's case though she also had had some strokes, is of much longer duration; she lived with me for 9 years.
After my mother was diagnosed with dementia, we decided she could no longer live alone, and my OH re-made a portion of our downstairs for her, putting in a small bathroom with walk-in shower, along with toilet and basin, off a large room that we used as "her" room and which is now, since her death, a lovely sitting room for us. I enjoyed having my mother here, however hard it was, because she refused to be placed in a care facility, and my work is such that I could keep care of her and only be off site a few days a week, working from home other days. My OH was supportive the entire time.
If you are willing to do this, and you think you have the patience and internal resources (strong emotional resources, I mean), then this would create a situation of wonderful possibility for your mother - *and* for you. I learned so much by watching my mother cope with her increasing dementia. We talked about it plainly: when we went to the doctor, I went with her, and we opened up all our conversations with, "Well, you will remember, Dr. X, that we have dementia, and we want to say this is what we are doing now, etc etc." I would put my observations of her behaviors into a letter to the doctor, which I took with me every visit. He would read my letter in advance and then be prepared for our little conversation about my mother's condition. I did as much as possible to make whatever she was facing seem as normal as possible. I believe she was happy here. I used her funds - instead of just handling them over to a care home - to purchase for her one-on-one care for the daytimes, eventually. It was cost effective to have her stay here rather than place her in a home. She would have run out of money, if we had placed her in a home from the start.
I don't know your financial situation, and I don't know your level of emotional strength or what your work life and entertainment needs might be, but I signed in this morning to say to you - those of you caring for your loved ones - it *is* possible to have your parent at home, if you are willing to change your lives for them. But that is what it takes: you have to change your life and wrap your life around your parent's end of life. For me, this was a gift to *me* to do. I learned so much about myself, my inner resources and my resourcefulness, and I helped my mother cope with a most difficult part of living (which is facing the fear of death and death itself). It's not for everyone, but it was an experience I'll always cherish.