Continuity mistake: In the scene where Dalton screams after falling off the ladder, when Josh runs to the attic to make sure he is alright his shirt is untucked with no tie. However when in the attic his shirt is buttoned with a tie.

Insidious (2010)
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Directed by: James Wan
Starring: Patrick Wilson, Rose Byrne, Lin Shaye, Ty Simpkins
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Elise Reiner: Who is she?
Elise Reiner: A parasite. She befriended your astral body and lured you into the further just as Dalton has been.
Question: When Josh is in the further looking for Dalton, what is the deal with the family that looks like mannequins and has the creepy smiles? Why does the one girl shoot the family? Is there any back story on it?
Answer: They are just people trapped in the further after their terrible death. It would be nice to later find out the back story on them in a future film.
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Answer: It's implied that the girl went crazy and killed her family, but it's not really elaborated on. They're just some of the many spirits to be trapped in and haunt the Further, likely due to the violent nature of their deaths.