Board Thread:General Discussion/@comment-10231322-20130530193219/@comment-5102537-20130530203304

When Mordred first appeared as a maybe ten year old boy, Arthur was around 21 years old, so he would be a very, very young father...

Being the son of Morgause would be possible, yet there was no hint about Mordred's parents at all.

And being Agravaine's brother would make Igraine and Agravaine's parents very, very old parents, given that Agravaine and Uther were probably around the the same age, which would make Igraine and Agravaine's parents being approx. Gaius' age, in case they were even still alive when Mordred was born. A woman that age or a few years younger wouldn't be able to have children anymore, except maybe if the du Bois male (Igraine/Tristan/Agravaine's father) had a child with a much younger woman. It would be odd anyway since Mordred being Agravaine and Igraine's brother would make him Arthur's uncle....

I think Mordred is not related to anyone we've been introduced to on the show.

EDIT: And I forgot: welcome to this Wikia! I hope you'll enjoy the site :-)