Xu Dasao, also called Xing'er, is one of Xu Sui's sisters in the Xu family. She is described as having only ever used the cheap seven-cent clam oil before receiving a box of Snowflake Cream from Xu Sui. She opened the cream and remarked that it smelled so good, indicating her appreciation for the luxurious gift. She helps with household chores, washing her hands and carrying dishes to the table after meals. The Xu family had no objections to Xu Weiguo spending his money on gifts for their eldest sister, viewing the shoes and other items as appropriate tokens of goodwill with Xu Bing's help making Xu Weiguo's temporary work legitimate. Zhang Yunxiu handed her the Snowflake Cream and suggested that she and the mother and another sister would try it together.
