What are the different endings?

1. Mr. Duncan dies in the fire after Richard Wells sets it on fire. Richard Wells donates money to the church in his memory said he died trying to save the church for burning down. Adam has a normal life.

2. The story ends as it does, except there is more added to it. Richard Wells goes to the parents of the bully who was killed by Zachary in Adam's body. Paul realises that his son has the evil Gene in him. He asks his wife to leave the shed. He takes a rope and is about to strangle Zachary/Adam. His wife leaves, realises something is wrong, sees Adam/Zachary being strangled and screams. Then we see Adam Well's grave. We first think Paul managed to kill Adam/Zachry then later they show Adam the original Adam's grave. We see him having the same conversation as he did when he first met Adam's parents after Adam was killed.

3. Richard Wells returns to the Duncan's residence after attacking Paul. There Adam is waiting for him, only Zachary has completely taken over his body. Zachary locked Mrs. Duncan in the basement with poisionoue gas. Richard hears her and trieds to save her. Zachary injects his father with poison killing him. Adam starts a new life. Zachary grabs him and pulls him in the closet showing that he is still with them.

4. Adam is seeing celebrating his ninth birthday. Same ending. Richard Wells comes home to Adam when he is in the Zachary mode. Zachary tells him he loves him and Richard says he love him as well. Zachary asks if he is mad at him and he says nothing he does cam make him mad. That also happened in third ending BTW. Same thing happens. Zachary injects Richard with poison with one of his needles. Richard dies. Adam is seeing his ninth birthday and it indicates that he has not had Zachary in his dreams ever since.