Go to supermarket or bulk barn and get corn meal. Corn meal is ground corn. Spread the corn meal around the area where you find ants.
The ants will bring the corn meal home and start eating them. (all of them include the queen) However their degistive system cannot digest corn and they will soon die after.
It is a safe way to deal with ants at home especially those who have kids. It may take a few days but it works like a charm.