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talk to him in tamil on a day-to-day basis. discuss his day at preschool, etc. or your day at work or if you are at home, talk to him about what you are doing, where you are going, etc.
i am working now but when i was at home, i used to say aloud the recipes or ingredients, things that i used in my cooking, to my daughter, if i did not have anything else to talk about
basically, just talk, talk, talk...