Good God, what a horrible mother.
Smokes weed in the house, with kids home, and doesn't make much of an effort hiding it with her kid coming in the room, not to mention the place would absolutely reek with weed smell. She has an impressionable teenage daughter in the house and as a mother she still smokes at home. She shows utter lack of concern for her kids in terms of safety. The house starts getting haunted and she thinks to use her kid on the speedy floor thing - a risk no normal parent would take. You notice something like that will happen, you don't wait, you send the kids to grandma ASAP. That's all the examples I can think of for now, but what a cursed creature this mother is. I don't care how liberal you are with recreational marijuana whether it's in a place where it's legal or illegal, this is plain disastrous parenting.
And I haven't even gotten to talking about pervert undertones in the movie making that once analyzed quite heavily implies that people making the movie had an unnatural attraction to children and teenagers. And don't give me "some teen chicks are totally hot" argument, because it's just not right with a hairy stinking overclass 50-year-old feeling a little grope happy around teenagers and children.