What does "one family, three father and sons" refer to in Jianlan (Cymbidium ensifolium)?

Currently the outstanding top choice among the Sanxingdie (triple-lip butterfly) Sijilan (four-season orchid) varieties produced in Sichuan! This variety has large flowers, with distinct spots and blocks on the three lips, large spots and blocks, stable blooming characteristics, and leaf shape with strong wave patterns, with obvious features! This variety belongs to the small-plant, large-flower type, with leaves that naturally twist and have wave patterns, with obvious features and easy identification!