Epiphyllum

This is my first flower of the year on one of my three Epiphyllum cacti. I had several flowers last year, but this may be the only one this time. I inherited these cacti from my mother whose plants had got too large and messy, so she gave me some cuttings which grew into the plants I now have. All my three have pink/red flowers, so a couple of years ago I bought a yellow one at the Chelsea Flower Show. It is still too small to flower, but maybe in another five years...... !