Q.What Is This Cactus?
First pix is of a very neglected houseplant. Second pix is of a stem from a healthier plant. Epiphyllum-like” leaf” is about 8 inches lone and has three thin stems growing out. Parent plant seemed to be drooping, not trying to climb. Does anyone know what it could be?

Certified GKH Gardening Expert
Unfortunately, your photo did not come through. I am unable to identify the plant in question.
In the meantime, this collection of articles will go over several types of Epiphyllums, and their care:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/epiphyllum