After you put the kids to bed at night, set out a bowl of oatmeal and cement mixed together. Remember to pick it up in the morning before you let the kids out. After about a week of this you will not see any more rats. They eat the mixture and die. The cement blocks their intestine. If there are as many as you say the smell might be hard to put up with for awhile. If any other critters eat the mixture they will die also.