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This is a long-running project investigating how split-case-marking systems develop in children acquiring languages that have such systems. Both Tamil and Hindi exhibit so-called 'split-accusativity' in the case-marking of its direct object arguments (differential object marking), and Hindi also has a 'split-ergative' pattern (differential subject marking). In our research, longitudinal corpora of naturalistic child-caregiver interactions in Hindi and Tamil are transcribed, coded, and analyzed to explore the development of case-marking patterns in three children acquiring Hindi and three children acquiring Tamil.