You will be meeting Gawain's entire family in the next few instalments, simply because it's important that you know them :-). But don't worry, I'll be getting to the point. Eventually ;P.
What went before
The kings of Britain are meeting in King Lot's stronghold. Uriens of Gorre is one of them, and he has brought a little boy with him in whom Morgana shows an interest...
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Meet Gawain's brothers. All three of them.