Objective: This study investigates sex and ethnicity in relationships of care using data from Wave 4 of LiLACS NZ, a longitudinal study of Māori and non‐Māori New Zealanders of advanced age. Methods: Informal primary carers for LiLACS NZ participants were interviewed about aspects of caregiving. Data were analysed by gender and ethnic group of the LiLACS NZ participant. Results: Carers were mostly adult children or partners, and three‐quarters of them were women.