Hi Lorna. I know a lot about what you are experiencing. Almost everyone I know who transtions would be very familiar with your lament. Losing your family is so common as to be a trueism.
My mother is in a nursing home, 88 years old, blind, and partially deaf, and has dementia. She has been there for three years now. I transitioned after she had to go to the nursing home, and since then I have not been invited to participate with my sister's family in
any holidays, where I was always included before. If I see any of them, it's my mother's room at the nursing home when we accidently overlap for visits. They leave quickly in such a circumstance as though I am going to contaminate them, using the most thin of hasty excuses, which my blind mother does not miss.
I will spend part of Thanksgiving with friends who are more supportive and accepting than my remaining family, and make a visit to my mother. Christmas Eve will be the same. But Christmas day will be spent working to make part of the dinner for the community dinner at the local highschool.
In years past I have volunteered at the community Thanksgiving feeds for the homeless and poor, cooking, serving and cleaning up. A lot of work but the fellowship with other women and a few men making a difference make the holiday more real. I will still go and help clean up for a few hours, but I will have dinner with my friends who are also alone.
Christmas last year was a real blast, as I was Mrs. Claus (in a stretchy red satin dress with white fake fur trim -- It just happened to fit!!!

) handing out gifts to excited little kids, and older people who had no one. It was particularly nice to see the elderly smile, with sparkling eyes, and each would say, no matter what the gift and that there was no name on it, "Oh, that's just what I have been wishing for!" I guess when you have little, almost anything qualifies as just what you have been wishing for, huh.
I have plans to do that again for Christmas. I care nothing for the religious overtones, but helping to make at least a few days better for others is worth the work.
"It’s not given to anyone to have no regrets; only to decide, through the choices we make, which regrets we’ll have,"
David Weber – In Fury Born