User blog comment:Merlin919/Is Morgause, Vivienne and Gorlois's daughter/@comment-5102537-20120815202410/@comment-5102537-20120816093525

Hi Wizard Robin,

when Morgause appeared for the first time, Gaius told Uther about the crest on the bracelet and he said "There is only one person other than Morgana who would have cause to wear such a bracelet. That is her half-sister."

That was long before Uther confessed that he was Morgana's real father. So since Gaius thought even at that point of time that Morgause and Morgana were half-sisters and not full sisters, he knew that they were either related through their mother OR their father. If Gaius thought that Gorlois was their father, Vivienne couldn't have been the mother of both (because they would have been full sisters and not half sisters). Later we learnt that Vivienne was Morgana's mother. If Vivienne was also Morgause's mother, Gorlois can't be Morgause's father (again, if he was, Gaius would have thought they were full sisters). IF Gorlois was Morgause's father, Gaius would have thought that Morgana and Morgause share the same father but not the same mother, so he th3n must have excluded Vivienne as the mother of both. When Uther later told Gaius that he was Morgana's father and Vivienne her mother, Morgause and Morgana are either NOT half-sisters at all or they share the same mother, Vivienne in this case.

To make it short: If Gorlois was Morgause's father, M. and M. are not half-sisters and certainly not full sisters. If They are half-sisters, they share the same mother because Uther wasn't Morgause's father.

Morgause being Morgana's half-sister= mother is Vivienne, father unknown.

Morgause NOT being Morgana's half-sister = mother unknown and Gorlois her father.

Morgana's parents were Vivienne and Uther.

The important hint appeared in The Sins of the Father, when Gaius thought/said they were half sisters (and so did Uther, at least pretending) that Morgause and Morgana were half-sisters before he learnt about Uther being Morgana's father.