The boy must come with me, he does not belong here
This is my father...
My Lord, this is Mordred
All the babies born on May day were sent to sea to drown, a hefty price to pay to end the prophecy that only one would live to complete, maybe. King Arthur detests the decision, but he feels it must be done at the word of Merlin and to save his son and nephew a hard and bitter life.
His son survives and is discovered by a man and woman who had recently lost their child and decide to take him in, naming him Tad. For years he was happy there, until one day a woman came for him and told him his real name. Mordred. And she took him away.
I don't care
Years after living with his (step) father, King Loth, Mordred followed his brothers' paths to Camelot. Though he did not wish to be a knight, he wanted to meet his real father. King Arthur. He knew of the prophecy now and he knew of his lineage, and he wished not to kill Arthur but to be his son.
Knighted anyway, he left on a quest to fight his fate. During this quest he encountered three women with the string of life, suffered his aunt Morgan's home only allowing him to go where he is "meant" to be, and much more. But he also met a girl. A girl who he thought he could marry, until she found out who he really was. His last hope of fighting his fate.
Gull! No! I'll kill you Merlin!
On his way back, Mordred found a garden with a merlin trapped within playing tunes upon his cage. Out of pity and desire to do something good, he set it free. The day after, his Gull passed and so that meant Nyneve... The bird he freed was Merlin and he had taken his revenge. Mordred had lost it all, and so he wished to give his soul up to stay behind when he died.
He had to give it to someone he trusted, and so he chose his father. But as his soul left his body and was to make it's way to Arthur, a crow swooped down and ate it before their eyes. But Mordred no longer cared, he felt nothing. Years went buy and the prophecy held true... Except Arthur did not die and Mordred lived on protecting him... from a bird's eye view.