Make sure it's day, place clear quartz all around the closet, add a lock on the closet and move your son's clothes to a drawer or cabinet, burn incense and smudge sticks in the closet, hang a crucifix near the closet and above your son's bed, line the floor at the closet door with salt. Also use water, and draw the PENTAGRAM (protection against evil entities) UNDER your son's bed or above his bed on the ceiling. Add a clear quartz at every corner of the room

If it's too much, at the very least, block your son's access to the closet, you'll need more than a lock because it's easy for entities to unlock things like that.

Children are young and able to see entities and spirits better, due to their developing mind and their vulnerability that doesn't quite scare the spirits. If there is something in there, it could lure him into the closet and hurt him or do something to his mind. Soon enough the entity will start to attempt to talk to him, and make him do dangerous things. Fire Chloe, find a new babysitter- (MAKE SURE SHE LEAVES THE HOUSE AND HAS NO ACCESS BACK IN) Lock the windows after she has left, lock the doors.