why i can't kill max

Max and Bryn decided to make some mud and play in it...totally fine with me as long as it stays outside. then, max completely covered bryn (should have taken pictures) from head to foot, including her face, in mud. still no huge problem until i saw that they got a bunch on the back patio and sliding glass door. i was pretty upset and max started crying and said, "you can't kill me, cuz then you won't have a boy". i decided to keep him.