the presence of other beings beside childrens can be seen as "normal".
the manifestation of visible creature near at slepping baby, probably can happens by the ectoplasm of the baby, or in other words, the "material" wich can be subtly visible is produced by "the baby energies" (most probably).
my "intention" is try to found what is "the best for all", and at first glance, I guess the baby could be trying to "alert" mother/grandmother about his "energetic" parapsych skills, which later in other adverse circumstances could even start to create a poltergeist phenomena.
another speculation could be that there is some "unbalanced" concern of the parents / relatives about the child, and the child may be trying to reveal this to them through this photography.
lastly, just for play the sake of frightening, the child may be unconsciously playing a trick, because the relatives are overly concerned with him all the time, and in this way his produces some phenomenon to attract more attention.
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Ectplast Mediums are very powerfull. If this photo is not montage, there is certainly an ectoplasty medium present there, which can be either the child or someone other in the same house with that "skill".
each case is "one case" and has to be viewed very carefully, without precipitation.
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I suggest a change of the name Horner demon to Horner Daemon, because the litle horn represents a young, maybe a Fauno, Fausto or Pan elemental (from coletive unconscious). BTW, these symbols are tradicional protectors of nature.