That has to be upsetting to the children. I am not sure I wouldn't be upset too. But I also see the beauty of nature at work.
We have had hawks swoop through the trees right over our head, so close we could feel the wind on our faces. I have also watched Jays and Crows harrass hawks and drive them from the area. We found a stunned hawk standing on the yellow line in a high traffic area, after scooping it up and moving it to safety, it flew off in a rush.
If it got my chickens - well, it would be sad, and I would need to find a way to keep my yard from becoming a feeding station - I wonder if I can hire some crows?
Take care, consoul your kids as best you can and take care.