Q.weeds in Lawn.
I want to naturally kill grass weeds while keeping the grass safe for dogs and children who walk through the yard,

These links have some help for you.
https://www.gardeningknowhow.com/special/organic/weed-it-and-reap-how-to-make-your-garden-more-appealing-without-chemicals.htm
https://www.gardeningknowhow.com/special/organic/using-salt-to-kill-weeds.htm
https://www.gardeningknowhow.com/special/organic/homemade-pet-friendly-weed-killer.htm
https://www.gardeningknowhow.com/special/organic/using-sugar-to-kill-weeds.htm