The girls here have the advice covered! I just wanted to add that I have used the feliway diffusers and they really helped with my one girl who was very high strung, we don't have kids but I know it really does help to calm the kitties. Best of luck!
And also my oldest girl is terrified of any child under 3 feet tall... she reacts in much the same manner to yours. So it could be fear, not anger or jelousy.
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“The greatness of a nation and its moral progress can be judged by the way its animals are treated” -Mahatma Gandhi
"We're the renegades, we're the people; With our own philosophies; We change the course of history; Everyday people like you and me"- R A T M