What are the two most credible genealogies that Wang Han said?

Wang Han mentioned in "Chinese Restaurant" that "the most credible genealogy is grave and kitchen", which is a common saying, not specifically referring to two specific genealogies. Family history and traditional values can be found in graves and kitchens, because these two places are the most important places in family life. The grave represents the passing of family members and the inheritance of family history, while the kitchen is an important place of family life, representing the inheritance of family food culture and traditional values.