User blog comment:Emily Windsnap/Is Gaius related to Merlin?/@comment-173.63.176.206-20150311215951

Although Netflix might be wrong, it says and I quote, "This family-oriented retelling of the King Arthur legend finds Merlin arriving in Camelot, where he hones his magic skills with the help of his UNCLE." Although it was never actually mentioned in the series- one can assume that Gaius is in fact, Merlin's uncle.