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I have a couple of suggestions for your mosquito problems. I have read (but haven't checked out) that using a shallow white dish, fill it with water, add a few drops of Joy liquid dishwashing detergent. The one giving that hint said it kills the mosquitos, usually within 10 - 12 feet of getting a drink from it. Makes you wonder how safe it is to eat from dishes washed in it, doesn't it?
Another great bug repellant that doesn't kill them, cook with lots of garlic, it makes you less tasty to mosquitoes, ticks and chiggers.This does work- I went from averaging 15 to 25 tick bites per day to none at all last year. I have started filling empty gel caps with garlic powder and taking 2 or 3 of them each day, however your kids probably won't like them that way but probably won't object to garlic cooked in the food.
Another one that works for my family - Put about 1-2 cups ACV to the kids bathwater each day, or even rub them down with straight ACV (careful around the eyes as even the fumes can make them burn) and let them dry off before dressing and going outside. This even works against those dratted brown flies in Florida (August) that look like our black house flies but are brown and love to bite you. This only works as long as the vinegar is on - if they play in water, or otherwise wash the vinegar off, you'll have to reapply the vinegar.