From growing up with them, dunno how old the one Dad currently has is, but ... O think it was from one of my grandparents, originally, and they were all deceased by the time I was 12 ...

Water enough, but not every day. They are not cactuses, despite the name, they are succulents. Make sure the pot has good drainage. Every few years, repot it so it has good fresh dirt, fertilize a little after blossom time is over, but not too much ... If you don't want it to get too huge, trim it back, you can always root the trimmings and give them away ...

They prefer benign neglect to overwatering or fertilizing. And to get blossom, put them in a window that gets some light but not direct sunlight in the summer. The changing length of days is what triggers the blossom cycle. I had one in a West-facing window where I worked, and it blossomed every year from about Halloween to Easter!