Julie Smith, 52, says she was amazed when she first saw the picture, taken by her daughter showing her grandson, five-year-old Sirus, standing next to a childlike, spectral figure.
The photo was taken in the family home in Redhill, Surrey, where it's claimed there have been a series of spooky goings-on including things regularly being moved around.
Julie - who insists the photo is not faked - says she and her daughter Sarah are not too bothered by the ghostly apparition as Sirus always seems to get on well with the spook.
Julie, said: "My daughter was just taking pictures of her children larking about with her new phone, when she saw that the first photo of her two boys had a halo over both of them.
"She thought 'this isn't right' and deleted it, and it was when she took the next picture that we noticed Sirus' little playmate."
She added that they were not too alarmed to see a ghost because they have a friend who has previously told them there are sprits in the house, including a little girl who plays with Sirus.
"Pete told us that Sirus has a little playmate, a little girl, this is who we think it could be in the photo - it's very clear that it is a little person," Julie added.
"When he was a baby, his mum was in the kitchen and Sirus was in the living room in a crib. He started crying, when she walked in the crib was moving as if someone was rocking it."