I can sympathize....the last two years we've been getting invaded by the little buggers as well, as soon as it starts to get warmer outside.
One thing that we've found that really works is a product called Terro Carpenter Ant and Termite Spray, which you can spray along the foundation of your house, where it meets the ground. That will cut down a lot on how many actually come into the house. Supposedly, once the spray dries it is harmles to children and pets. We have 3 dogs, who have the run of our yard, and have had no problems with the dogs while using it. It is also odor free, once it dries.
Terro also makes a plastic ant bait, which is filled with liquid for the ants to feed on. These can be placed under things on your kitchen counters, such as your microwave or dish drainers. The ants that show up on your counter will enter the bait, feed on the liquid inside, and take it back to the nest for the others to feed on. Within 3 or 4 days, the ants are gone!
If you need to treat somewhere that its impossible to keep your children or pets away from, such as in window sills, or under pet food dishes, another thing that works and is harmless to kids or pets are Bounce Dryer Sheets. Ants hate them, and will not crawl over them, not even to get to a full dish of pet food. They can also be placed between your indoor windows and storm windows, which will keep the ants from coming in the cracks in the window sills. We also fold them up and thumb tack them on the bottom of our front and back door, and have had good results with that.
I hope this information helps. Good luck with getting rid of the little pests. They drive me nuts every summmer!