Diatomaceous earth - I fear that is spelled wrong. It is a white powder sold under several brand names. It shreds the exoskeletons of ants, but is absolutely harmless to pets or children. Sprinkle it on the ant hills. Reapply after a rain. You have to keep at it.
If you don't mind using a pesticide, the Raid spray foam is a surefire way, and works immediately.
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