Sister kills her brother?!

I had a little girl who was 8 and her name was Rayashae and her parents had a baby boy named Hayatesralmon (weird names ik) and when the boy turned 4 and the girl was 12 the girl went to the kitchen and picked up a pan and went to her brothers room and put him in the pan and then it said he died. Idk why this happened but its really confusing and funny and weird.