We had a big problem with ants in the summer. We tried every natural remedy we could-- cinnamon, peppermint oil, etc. --then borax, but they were no match for the ants. Ultimately we did call out an exterminator who gave us treatment options with our son and dog in mind-- we took his recommendation of a conservative approach that involved spraying a lot outside of our house, placing bait and spray in the house where it was out of reach/access to our kid and dog, and then fixing some worn out caulk around our window that he found that was allowing them to get in. He offered to come back and pursue a more aggressive option if that didn't work, but it had worked great. Hopefully you can find a solution you're comfortable with but, if not, wanted to put out there that the exterminators can help with kids/pets in mind!