With kids and pets, a natural way to kill weeds is your best bet. This method is also more economical than commercial weed killers. You may already have these items around the house. It probably only costs $1.00 a bottle to make.
This homemade product is best used on weeds that come up between bricks / pavers on patios. If used on a lawn or garden it will kill grass and flowers / vegetable plants. It cannot discriminate between weeds and other plants.
I use a cocktail of (5%) white vinegar, plain table salt and liquid dish soap to quickly kill weeds on my brick patio. Acetic acid in the 5% vinegar and the salt are both very good at drawing moisture from weeds. This causes death to the plants.
Stick to 5% white vinegar. Do NOT use the stronger vinegars available. You can find 5% white vinegar in the food section of the grocery store. Dish soap acts as a surfactant. The soap helps the vinegar / salt solution to stick to the leaves.
Applied on a warm, sunny day, the results of this homemade weed killer spray will be obvious in a few hours. Total death in a few days.