We examine the gender gap in housework in Vietnam among siblings aged less than 18 years. We show daughters undertake 5.25 minutes more unpaid housework per day than sons. However, the gender gap in housework is negligible for children aged less than 14 years. A decline in the gender gap at 15 years of age suggests parents eventually begin to consider the education of their daughters. Before then, however, the gender gap increases with age and can be even greater if daughters also engage in paid work.