I hear ya--accidents do happen and sometimes danger isn't where we think it is.
One time my wife was so insistent on making a PB sandwich while I was sanitizing my bottles on bottling day and she proceeded to start a domino effect of all my delabelled, washed, and sanitized bottles representing the previous 3 hours work cascading over the counter onto the floor. My barefoot 7 yo had just walked into the kitchen and was in the path of all the shattered glass tsunami, but I fortunately had seen the domino effect happening, instinctively turned and rushed to grab him, and lifted him out of the way just in time.
Some parts of brewing aren't so dangerous. Yet my 2 boys, now ages 10 and 7.5, are always doing what brothers do--push and shove and annoy each other. I do like to share my love for this hobby with them. They occasionally help me weigh out the hops and grind the grains and pour the RO water out of the plastic jug into the boil kettle at the beginning of the brew day, but they've not been allowed around the boil kettle, the hot liquids, or the cleaning chemicals. If they do come out to see what I'm doing, I only let one boy come out at a time and safety is paramount in my mind. I keep them away from the kettle.
IMO, you're never alone when you brew--Mr Murphy is always present, and never helpful. The stories on this forum attest to that.