We construct a two-periods OLG model in which households produce domestically a non-observable and transmissible commodity: "household culture" using cultural goods and transmitted culture as inputs. Parents fail to internalise the effect of unvoluntarily transmitted culture on their children's welfare. The social planner can implement the first best optimum if it is possible to subsidize cultural goods purchased by the young generation alone. When considering the Cobb-Douglas case, we find that the marginal subsidy rate is equal to the elasticity of cultural externality upon the cultural production of the young.