I am USA citizen by birth but have been living in Canada with 3 kids for last 12 years. Please advise what I need to do in order to obtain US citizenship for my kids.
Your kids are likely already citizens. From your post I assume you have lived in the US at least 5 years (2 years past age 14) and the kids are still all under 18.
This page explains the requirements to register them at a Canadian consulate:
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