User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Arthur/Guinevere's Child/@comment-3012002-20120928082904/@comment-4190137-20120928092529

I remember looking at an article saying Arthur passed his crown onto Constantine. I am very aware that Constantine isn't his son, but his cousin. But Merlin is known to not be 100% like the legend so I think they will change it slightly and make Constantine Arthur and Gwen's child (source).

Anyway I think I can trust the sources that informed me of this information (Express.co.uk, TV.com Series 5 spoilers thread). Whether if you can trust them or not it's up to you. But either way we will wait and see, not long left to wait! :D