grandparents

Ok, so i know this is weird because this answer is 4 to 5 years from when you asked this question. But, what happened is the real grandparents were working at the asylum. and the fake grandparents broke out and went to there house, knowing they had kids. They killed the real grandparents with the hammer. Hitting them a lot in the skull in face. and so when they came over, they got the wrong grandparents. and the mother did not know because the grandma put batter on the camera so she could not see. she called it an "accident". ok, so nana and pop pop are escaped convicts from the asylum who are insane and see things and do weird things. there real grandparents were killed by the mental convicts who escaped from the asylum. and they ended up with them because they basically killed the real grandparents and put them inside the box and hid their asylum suits in there too and changed into the real grandparents clothing. Boom!