The Qiao family was the same family that Zhao Changhe and Yue Hongling had encountered beyond the border. At the time, with so many issues at hand, they hadn't circled back to trouble them and later nearly forgot about them.
Gathering Leader Guigui from Yellow Sand Market knew about this, and Guigui's knowledge essentially meant that Vermilion Bird was aware, too. Therefore, Vermilion Bird naturally selected their family as the first target for this action. Before the reordering of the Chaotic World List, it had become difficult to have one's battles reported. Essentially, it was impossible to learn of others' information through the changes in the Chaotic World List, but the Worldly Society has its own "word on the street." Keeping abreast of such significant events was rather easy.
