Using data from the Nang Rong Projects social survey (N = 4,989), this work examines the effect of migrant remittances on household splits in an agrarian district of Thailand, a developing country experiencing tremendous economic, demographic, and social transformations. Results show that remittances sent from migrants (especially female migrants) to their origin households affect changes in household affiliation. Findings are consistent with a household allocation model, whereby money sent by migrant siblings significantly affects the movement of the migrant’s sisters and their husbands into a new household. Results suggest that remittances are a significant determinant of household nucleation, especially in the latter stages of the Thai household life cycle. Results also suggest that rural Thais still follow traditional postnuptial residence patterns.