The overall appearance says..Christmas cactus (or other holiday). But, if given correct lighting and care, this cactus blooms every 3 months. Huge deep red blooms, and I have had the great-grandmother plant for 25 years now. Every year, blooms every 3 months. Also, the older foliage near the base develops a triangular/3 sided stem. Photos attached.
Trying to Identify Species of Cactus
Certified GKH Gardening Expert
It is an easter cactus based on identification of bloom and stem segments. Holiday cacti have the potential to bloom 2-3 times a year if the conditions are just right.