If someone told me that story I might think he got whooshed down to the basement and buried under the floor!
I am in agreement with you here...either this kid just ran away from home(and from someone more earthly, rather than some spirit being)or something bad happened to him in that home(the harm again coming from some earthly person, and not some spirit bursting through the floor)...just my personal opinion of course, but one could not help but think that, especially after seeing this mom rant and rave and carry on the way she did...