I am struggling to find a horror movie, would appreciate your knowledgeable help:
It starts with a small boy being lost during a family trip (as far as I remember, to an amusement park).
His brother ends up seeing him occasionally around the area where they live, while his parents try to prove him it is impossible.
The kid ends up being found in something like a vampire house just next to the one of the family. In that house, there is several kids, who have also been turned into vampires- they wear suits, sleep in glass coffins in a dried out swimming pool inside that house, and have a large purple room with a tv, that seems to be luxury for that area.
It might sound super vague, but that is as much as I can remember. Would be super grateful for your help.