As for how many people are in the Lu Family, Manman, who had just returned to her maternal home, had no idea.
Having been away from home for a long time, when the daughter of the Lu Family says she's returning, the family ought to make a statement, a rather grand ceremony. The low-profile Lu Family perhaps did not want to spread the news far and wide, risking their daughter's safety. Not informing outsiders was acceptable, but for relatives and friends who shared deep ties with the Lu Family, the ritual of notification was indispensable.
The banquet welcoming the return of the Lu Family's daughter had long been decided upon and was certain to be held. On the day when the DNA results came out and Lu Heyan took his son to negotiate with the Wen Family, the old master of the Lu Family gathered some of the elders in the small courtyard of his home to determine the auspicious day for the family banquet.