Color and modern movie.

The movie is about a boy who volunteers/works at a library or bookstore. There is a couple that comes in and he kind of stalks them. They lost their son and treat him like he is theirs. He pretends to be their son and thinks this is some therapy for all of them (he’s a needy clinger and they’re grieving parents)…only no the parents are really fucked up. They try to make him be like their son and cripple him like their son was crippled. It all leads to him lashing out that he is not their son so the mother freaks out and decides he needs to be reborn again. It’s revealed they have done this several times with other boys. She buries him in the backyward or frontyard. There’s also some girl he has a weird friendship with who later comes on and saves him by digging him up out of the hole they buried him in. For some horror movie cliche reason the two decide to hide in the house with the crazy parents. The mother goes outside and sees the grave dug up and her crazy self assumes that the rebirthing finally worked. So she and the dad search the house for her son.