When my mother died, close to 15 years ago, I was the fortunate recipient of her Christmas Cactus.
Every wonder why your "Christmas" cactus blooms too early? It's possible that it's a Thanksgiving cactus. Although similar in appearance, they are different plants. Both Christmas cactus (Schlumbergera russelliana, aka S. bridgesii) and Thanksgiving cactus (Schlumbergera truncata) respond to the shortening days of autumn by setting flower buds -- Thanksgiving cactus just responds about a month sooner. To tell them apart, examine the leaf pads. Leaf segments of Christmas cactus are gently lobed; those of Thanksgiving cactus have spikes on the sides of the stem segments.
If your cactus blooms too late, it might be an Easter cactus (Hatiora gaertneri, formerly called Schlumbergera gaertneri and Rhipsalidopsis gaertneri). Look closely at the tops of the leaf segments. If there are small bristles, you have an Easter cactus."