The family in the Enfield case consisted of a mother, two daughters and two sons; Margaret, aged 12, a younger sister, Janet, aged 11, Johnny, aged 10 and Billy, aged 7. Billy had a speech impediment. Johnny featured only marginally in the inexplicable events, at least 26 of which the investigators considered could not be accounted for by fraud. These included moving furniture, flying marbles, interference with bedclothes, cold breezes, pools of water on the floor, apparitions, physical assaults, graffiti, equipment malfunction and failure, disappearance and reappearance of objects, apparent levitations, and fires which spontaneously ignited and extinguished themselves.
Among other alleged phenomena they witnessed was Janet speaking using her false vocal folds for hours on end while she was apparently possessed by another entity. Speaking in this way is believed to be medically impossible. When speaking with the false cords Janet said she was "Bill" who had died in the house of a brain hemorrhage. The "Bill" persona habitually made jokes and exhibited a very nasty temper, swearing at Maurice, once calling him a "fucking old sod." Grosse was contacted by a man who claimed to be Bill's son. Recordings were made of these occurrences.