Some Say That Photoshop,

is a wondrous thing,

for myself I do not know how it works but it appears that Redditor burnmongham does and used it or some similar application to stitch two pictures together, so all of the family appeared in the same picture, after posting it he became aware 1 month or so later of a slight error, so what is it? scroll down for the answer,

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clue, how many three armed kids do you know?