My theory
So...ron:doll,dad:red face,mom:mom.why doll head look wierd?because dad/red face suffocating ron neck/doll because of drinking bear.then dad hide on cheap motel but being haunted by ron,and then mom wake up founding ron dead.mom being introgate by cop but we help mom by using the spell/motel card.dad has been jail because of ron.ron found dead on cupboard...RIGHT?the other children died to.the girl die because of tomb.the middle child found dead on campfire.the kid that not use dress found dead on back of car.