Lunar new year, parenting sister-in-law, nanny. Sister-in-law's business is a part of domestic service, including three businesses: monthly, childcare and nanny. Yue Yue is responsible for taking care of the postpartum pregnant women, the elder sister-in-law is responsible for taking care of the baby, and the nanny is responsible for taking care of people who have no self-care ability. Domestic service refers to the socialization, specialization and marketization of some family affairs, which belongs to the people's livelihood category.