What a trip down memory lane !!!!
Let me explain !! The photo of the plant on the link looks virtually identical to a plant which I used to care for in an office in which I worked during the 1970s !! I regarded the plant itself as quite ugly - certainly nothing to look at with long, lank sharpish leaves .... BUT the flowers - so beautiful - red - such a contrast to the leaves !! I managed to identify it as an epiphyllium and took greater care of it from then on - I left it behind when I moved on and had forgotten all about it until coming across this post.
Thanks for the memories, as they say.
Enjoy it when it flowers and what an achievement for you to have the plant in the family for such a length of time - you have obviously beeen doing all the right things 