If you look at the middle picture on the left side you will see a 'baby' Christmas Cactus I started growing last month just by snapping off a small bit of the mother plant in the rest of the pictures. I really don't recall when I got the original plant but I do know I have given 'baby samples' away to about 10 people plus I am always snapping off a growing branch and putting it in a different pot with other plants.
I don't know why it is called a 'Christmas Cactus' because it does bloom all year round. I believe I bought it around Christmas time so maybe that's the answer but just out of curiosity I went to Bing.com and asked, "Why is it called a "Christmas Cactus"? and I got a long involved answer but I think it is basically because I grow it indoors. Here is the answer: https://blog.gardeningknowhow.com/tbt/history-of-christmas-cactus-plants/
I do know for many years Mother Nature has been an important part of my life and no matter where I lived I grew plants indoors, even, if like when I lived in Memphis, where I had a patio. I am, basically, an optometrist but I do have my down times, blue moments but all I have to do is look at a plant in bloom or a pepper growing in a pot or an Avocado pit in a glass of water starting to show roots and I can't but help get a smile on my face!
Over the years I have grown Romaine lettuce, cherry tomatoes, onions, etc., by putting them in pots of dirt on windowsills and, of course, all kinds of flowers of which right now I have Geraniums, Cuban Butterfly plants, the aforementioned peppers and Avocados, begonias plus of course, the 'Christmas Cactus' flowers.
In a couple of weeks I will probably get a Poinsettia plant and see if I can clip off a branch and grow my own!